diff --git a/src/main/java/emu/grasscutter/data/GameData.java b/src/main/java/emu/grasscutter/data/GameData.java
index a1ef20a8e..1a8597694 100644
--- a/src/main/java/emu/grasscutter/data/GameData.java
+++ b/src/main/java/emu/grasscutter/data/GameData.java
@@ -569,8 +569,8 @@ public final class GameData {
     private static final Int2IntMap trialAvatarIndexIdTrialActivityDataDataMap =
             new Int2IntOpenHashMap();
 
-    private static Map<Integer, List<Integer>> fetters = new HashMap<>();
-    private static Map<Integer, List<ShopGoodsData>> shopGoods = new HashMap<>();
+    private static final Map<Integer, List<Integer>> fetters = new HashMap<>();
+    private static final Map<Integer, List<ShopGoodsData>> shopGoods = new HashMap<>();
 
     // Getters with different names that stay for now
     public static Int2ObjectMap<MainQuestData> getMainQuestDataMap() {
diff --git a/src/main/java/emu/grasscutter/data/GameDepot.java b/src/main/java/emu/grasscutter/data/GameDepot.java
index b3c43bb21..34cfd57ee 100644
--- a/src/main/java/emu/grasscutter/data/GameDepot.java
+++ b/src/main/java/emu/grasscutter/data/GameDepot.java
@@ -13,17 +13,17 @@ import lombok.*;
 public class GameDepot {
     public static final int[] BLOCK_SIZE = new int[] {50, 500}; // Scales
 
-    private static Int2ObjectMap<WeightedList<ReliquaryMainPropData>> relicRandomMainPropDepot =
+    private static final Int2ObjectMap<WeightedList<ReliquaryMainPropData>> relicRandomMainPropDepot =
             new Int2ObjectOpenHashMap<>();
-    private static Int2ObjectMap<List<ReliquaryMainPropData>> relicMainPropDepot =
+    private static final Int2ObjectMap<List<ReliquaryMainPropData>> relicMainPropDepot =
             new Int2ObjectOpenHashMap<>();
-    private static Int2ObjectMap<List<ReliquaryAffixData>> relicAffixDepot =
+    private static final Int2ObjectMap<List<ReliquaryAffixData>> relicAffixDepot =
             new Int2ObjectOpenHashMap<>();
 
     @Getter @Setter private static Map<String, AvatarConfig> playerAbilities = new HashMap<>();
 
     @Getter
-    private static HashMap<SpawnDataEntry.GridBlockId, ArrayList<SpawnDataEntry>> spawnLists =
+    private static final HashMap<SpawnDataEntry.GridBlockId, ArrayList<SpawnDataEntry>> spawnLists =
             new HashMap<>();
 
     @Getter @Setter private static BlossomConfig blossomConfig;
diff --git a/src/main/java/emu/grasscutter/data/binout/OpenConfigEntry.java b/src/main/java/emu/grasscutter/data/binout/OpenConfigEntry.java
index 25f8055bf..6270eb601 100644
--- a/src/main/java/emu/grasscutter/data/binout/OpenConfigEntry.java
+++ b/src/main/java/emu/grasscutter/data/binout/OpenConfigEntry.java
@@ -51,8 +51,8 @@ public class OpenConfigEntry {
     }
 
     public static class SkillPointModifier {
-        private int skillId;
-        private int delta;
+        private final int skillId;
+        private final int delta;
 
         public SkillPointModifier(int skillId, int delta) {
             this.skillId = skillId;
diff --git a/src/main/java/emu/grasscutter/data/excels/ItemData.java b/src/main/java/emu/grasscutter/data/excels/ItemData.java
index de77a4ba6..edce795e1 100644
--- a/src/main/java/emu/grasscutter/data/excels/ItemData.java
+++ b/src/main/java/emu/grasscutter/data/excels/ItemData.java
@@ -24,7 +24,7 @@ public class ItemData extends GameResource {
     @Getter(onMethod_ = @Override)
     private int id;
 
-    private int stackLimit = 1;
+    private final int stackLimit = 1;
     private int maxUseCount;
     private int rankLevel;
     private String effectName;
@@ -37,7 +37,7 @@ public class ItemData extends GameResource {
     private int[] destroyReturnMaterialCount;
 
     // Enums
-    private ItemType itemType = ItemType.ITEM_NONE;
+    private final ItemType itemType = ItemType.ITEM_NONE;
     private MaterialType materialType = MaterialType.MATERIAL_NONE;
     private EquipType equipType = EquipType.EQUIP_NONE;
     private String effectType;
@@ -48,10 +48,10 @@ public class ItemData extends GameResource {
     private int[] satiationParams;
 
     // Usable item
-    private ItemUseTarget useTarget = ItemUseTarget.ITEM_USE_TARGET_NONE;
+    private final ItemUseTarget useTarget = ItemUseTarget.ITEM_USE_TARGET_NONE;
     private List<ItemUseData> itemUse;
     private List<ItemUseAction> itemUseActions;
-    private boolean useOnGain = false;
+    private final boolean useOnGain = false;
 
     // Relic
     private int mainPropDepotId;
@@ -79,7 +79,7 @@ public class ItemData extends GameResource {
     private int comfort;
     private List<Integer> furnType;
     private List<Integer> furnitureGadgetID;
-    private SpecialFurnitureType specialFurnitureType = SpecialFurnitureType.NOT_SPECIAL;
+    private final SpecialFurnitureType specialFurnitureType = SpecialFurnitureType.NOT_SPECIAL;
 
     @SerializedName(
             value = "roomSceneId",
diff --git a/src/main/java/emu/grasscutter/data/excels/PlayerLevelData.java b/src/main/java/emu/grasscutter/data/excels/PlayerLevelData.java
index 35632c990..59da00fe7 100644
--- a/src/main/java/emu/grasscutter/data/excels/PlayerLevelData.java
+++ b/src/main/java/emu/grasscutter/data/excels/PlayerLevelData.java
@@ -9,7 +9,7 @@ public class PlayerLevelData extends GameResource {
     private int level;
     private int exp;
     private int rewardId;
-    private int expeditionLimitAdd = 0;
+    private final int expeditionLimitAdd = 0;
     private int unlockWorldLevel;
     private long unlockDescTextMapHash;
 
diff --git a/src/main/java/emu/grasscutter/data/excels/ProudSkillData.java b/src/main/java/emu/grasscutter/data/excels/ProudSkillData.java
index 51d4ae288..fb17b3594 100644
--- a/src/main/java/emu/grasscutter/data/excels/ProudSkillData.java
+++ b/src/main/java/emu/grasscutter/data/excels/ProudSkillData.java
@@ -25,7 +25,7 @@ public class ProudSkillData extends GameResource {
     @Getter private long nameTextMapHash;
     @Transient private Iterable<ItemParamData> totalCostItems;
 
-    @Transient @Getter private Object2FloatMap<String> paramListMap = new Object2FloatOpenHashMap<>();
+    @Transient @Getter private final Object2FloatMap<String> paramListMap = new Object2FloatOpenHashMap<>();
 
     @Override
     public int getId() {
diff --git a/src/main/java/emu/grasscutter/data/excels/achievement/AchievementData.java b/src/main/java/emu/grasscutter/data/excels/achievement/AchievementData.java
index 3a3b7836d..d67cab89f 100644
--- a/src/main/java/emu/grasscutter/data/excels/achievement/AchievementData.java
+++ b/src/main/java/emu/grasscutter/data/excels/achievement/AchievementData.java
@@ -14,7 +14,7 @@ public class AchievementData extends GameResource {
     private static final AtomicBoolean isDivided = new AtomicBoolean();
     private int goalId;
     private int preStageAchievementId;
-    private Set<Integer> groupAchievementIdList = new HashSet<>();
+    private final Set<Integer> groupAchievementIdList = new HashSet<>();
     private boolean isParent;
     private long titleTextMapHash;
     private long descTextMapHash;
diff --git a/src/main/java/emu/grasscutter/data/excels/avatar/AvatarData.java b/src/main/java/emu/grasscutter/data/excels/avatar/AvatarData.java
index d897fc4e7..1b0823328 100644
--- a/src/main/java/emu/grasscutter/data/excels/avatar/AvatarData.java
+++ b/src/main/java/emu/grasscutter/data/excels/avatar/AvatarData.java
@@ -55,7 +55,7 @@ public class AvatarData extends GameResource {
     @Getter
     private IntList abilities;
     @Getter
-    private List<String> abilitieNames = new ArrayList<>();
+    private final List<String> abilitieNames = new ArrayList<>();
 
     @Getter
     private List<Integer> fetters;
diff --git a/src/main/java/emu/grasscutter/data/excels/tower/TowerLevelData.java b/src/main/java/emu/grasscutter/data/excels/tower/TowerLevelData.java
index e9fd62ff6..de36bd3b1 100644
--- a/src/main/java/emu/grasscutter/data/excels/tower/TowerLevelData.java
+++ b/src/main/java/emu/grasscutter/data/excels/tower/TowerLevelData.java
@@ -30,8 +30,8 @@ public class TowerLevelData extends GameResource {
     // Just packaging condition parameters for convenience.
     @Getter
     public class TowerCondTimeParams {
-        private int param1;
-        private int minimumTimeInSeconds;
+        private final int param1;
+        private final int minimumTimeInSeconds;
 
         public TowerCondTimeParams(int param1, int minimumTimeInSeconds) {
             this.param1 = param1;
@@ -41,9 +41,9 @@ public class TowerLevelData extends GameResource {
 
     @Getter
     public class TowerCondHpParams {
-        private int sceneId;
-        private int configId;
-        private int minimumHpPercentage;
+        private final int sceneId;
+        private final int configId;
+        private final int minimumHpPercentage;
 
         public TowerCondHpParams(int sceneId, int configId, int minimumHpPercentage) {
             this.sceneId = sceneId;
diff --git a/src/main/java/emu/grasscutter/data/server/Grid.java b/src/main/java/emu/grasscutter/data/server/Grid.java
index 624556d48..25f84559b 100644
--- a/src/main/java/emu/grasscutter/data/server/Grid.java
+++ b/src/main/java/emu/grasscutter/data/server/Grid.java
@@ -9,7 +9,7 @@ import java.util.*;
 
 public class Grid {
     public transient RTree<Map.Entry<GridPosition, Set<Integer>>, Geometry> gridOptimized = null;
-    private transient Set<Integer> nearbyGroups = new HashSet<>(100);
+    private final transient Set<Integer> nearbyGroups = new HashSet<>(100);
 
     public Map<GridPosition, Set<Integer>> grid = new LinkedHashMap<>();
 
diff --git a/src/main/java/emu/grasscutter/game/Account.java b/src/main/java/emu/grasscutter/game/Account.java
index c796b9981..e13475705 100644
--- a/src/main/java/emu/grasscutter/game/Account.java
+++ b/src/main/java/emu/grasscutter/game/Account.java
@@ -24,7 +24,7 @@ public class Account {
 
     private String token;
     private String sessionKey; // Session token for dispatch server
-    private List<String> permissions;
+    private final List<String> permissions;
     private Locale locale;
 
     private String banReason;
diff --git a/src/main/java/emu/grasscutter/game/ability/Ability.java b/src/main/java/emu/grasscutter/game/ability/Ability.java
index 0c7f5337e..76263f87c 100644
--- a/src/main/java/emu/grasscutter/game/ability/Ability.java
+++ b/src/main/java/emu/grasscutter/game/ability/Ability.java
@@ -12,20 +12,20 @@ import java.util.*;
 import lombok.Getter;
 
 public class Ability {
-    @Getter private AbilityData data;
-    @Getter private GameEntity owner;
-    @Getter private Player playerOwner;
+    @Getter private final AbilityData data;
+    @Getter private final GameEntity owner;
+    @Getter private final Player playerOwner;
 
-    @Getter private AbilityManager manager;
+    @Getter private final AbilityManager manager;
 
-    @Getter private Map<String, AbilityModifierController> modifiers = new HashMap<>();
-    @Getter private Object2FloatMap<String> abilitySpecials = new Object2FloatOpenHashMap<>();
+    @Getter private final Map<String, AbilityModifierController> modifiers = new HashMap<>();
+    @Getter private final Object2FloatMap<String> abilitySpecials = new Object2FloatOpenHashMap<>();
 
     @Getter
-    private static Map<String, Object2FloatMap<String>> abilitySpecialsModified = new HashMap<>();
+    private static final Map<String, Object2FloatMap<String>> abilitySpecialsModified = new HashMap<>();
 
-    @Getter private int hash;
-    @Getter private Set<Integer> avatarSkillStartIds;
+    @Getter private final int hash;
+    @Getter private final Set<Integer> avatarSkillStartIds;
 
     public Ability(AbilityData data, GameEntity owner, Player playerOwner) {
         this.data = data;
diff --git a/src/main/java/emu/grasscutter/game/ability/AbilityModifierController.java b/src/main/java/emu/grasscutter/game/ability/AbilityModifierController.java
index 370412fe5..a95c4fbda 100644
--- a/src/main/java/emu/grasscutter/game/ability/AbilityModifierController.java
+++ b/src/main/java/emu/grasscutter/game/ability/AbilityModifierController.java
@@ -4,10 +4,10 @@ import emu.grasscutter.data.binout.*;
 import lombok.Getter;
 
 public class AbilityModifierController {
-    @Getter private Ability ability;
+    @Getter private final Ability ability;
 
-    @Getter private AbilityData abilityData;
-    @Getter private AbilityModifier modifierData;
+    @Getter private final AbilityData abilityData;
+    @Getter private final AbilityModifier modifierData;
 
     public AbilityModifierController(
             Ability ability, AbilityData abilityData, AbilityModifier modifierData) {
diff --git a/src/main/java/emu/grasscutter/game/achievement/Achievement.java b/src/main/java/emu/grasscutter/game/achievement/Achievement.java
index 6f3a7dae1..2e935e111 100644
--- a/src/main/java/emu/grasscutter/game/achievement/Achievement.java
+++ b/src/main/java/emu/grasscutter/game/achievement/Achievement.java
@@ -9,8 +9,8 @@ import lombok.*;
 @Getter
 public class Achievement {
     @Setter private Status status;
-    private int id;
-    private int totalProgress;
+    private final int id;
+    private final int totalProgress;
     @Setter private int curProgress;
     @Setter private int finishTimestampSec;
 
diff --git a/src/main/java/emu/grasscutter/game/avatar/Avatar.java b/src/main/java/emu/grasscutter/game/avatar/Avatar.java
index be5774ed0..0bae0a2b4 100644
--- a/src/main/java/emu/grasscutter/game/avatar/Avatar.java
+++ b/src/main/java/emu/grasscutter/game/avatar/Avatar.java
@@ -61,13 +61,13 @@ public class Avatar {
 
     private List<Integer> fetters;
 
-    private Map<Integer, Integer> skillLevelMap = new Int2IntArrayMap(7); // Talent levels
+    private final Map<Integer, Integer> skillLevelMap = new Int2IntArrayMap(7); // Talent levels
 
     @Transient @Getter
-    private Map<Integer, Integer> skillExtraChargeMap = new Int2IntArrayMap(2); // Charges
+    private final Map<Integer, Integer> skillExtraChargeMap = new Int2IntArrayMap(2); // Charges
 
     @Transient
-    private Map<Integer, Integer> proudSkillBonusMap =
+    private final Map<Integer, Integer> proudSkillBonusMap =
             new Int2IntArrayMap(2); // Talent bonus levels (from const)
 
     @Getter private int skillDepotId;
diff --git a/src/main/java/emu/grasscutter/game/dungeons/DungeonEndStats.java b/src/main/java/emu/grasscutter/game/dungeons/DungeonEndStats.java
index f22eb78dc..f204860a7 100644
--- a/src/main/java/emu/grasscutter/game/dungeons/DungeonEndStats.java
+++ b/src/main/java/emu/grasscutter/game/dungeons/DungeonEndStats.java
@@ -4,10 +4,10 @@ import emu.grasscutter.game.dungeons.dungeon_results.BaseDungeonResult;
 import lombok.Getter;
 
 public class DungeonEndStats {
-    @Getter private int killedMonsters;
-    @Getter private int timeTaken;
-    @Getter private int openChestCount;
-    @Getter private BaseDungeonResult.DungeonEndReason dungeonResult;
+    @Getter private final int killedMonsters;
+    @Getter private final int timeTaken;
+    @Getter private final int openChestCount;
+    @Getter private final BaseDungeonResult.DungeonEndReason dungeonResult;
 
     public DungeonEndStats(
             int killedMonsters,
diff --git a/src/main/java/emu/grasscutter/game/entity/EntityClientGadget.java b/src/main/java/emu/grasscutter/game/entity/EntityClientGadget.java
index 8296c09c9..740e46f60 100644
--- a/src/main/java/emu/grasscutter/game/entity/EntityClientGadget.java
+++ b/src/main/java/emu/grasscutter/game/entity/EntityClientGadget.java
@@ -29,13 +29,13 @@ public class EntityClientGadget extends EntityBaseGadget {
     @Getter private final Player owner;
 
     @Getter(onMethod_ = @Override)
-    private int gadgetId;
+    private final int gadgetId;
 
-    @Getter private int ownerEntityId;
-    @Getter private int targetEntityId;
-    @Getter private boolean asyncLoad;
+    @Getter private final int ownerEntityId;
+    @Getter private final int targetEntityId;
+    @Getter private final boolean asyncLoad;
 
-    @Getter private int originalOwnerEntityId;
+    @Getter private final int originalOwnerEntityId;
 
     @Getter private final GadgetData gadgetData;
     private ConfigEntityGadget configGadget;
diff --git a/src/main/java/emu/grasscutter/game/entity/EntityMonster.java b/src/main/java/emu/grasscutter/game/entity/EntityMonster.java
index f60f17c13..37392a3e8 100644
--- a/src/main/java/emu/grasscutter/game/entity/EntityMonster.java
+++ b/src/main/java/emu/grasscutter/game/entity/EntityMonster.java
@@ -50,13 +50,13 @@ public class EntityMonster extends GameEntity {
     @Getter private final Position bornPos;
     @Getter private final int level;
     @Getter private EntityWeapon weaponEntity;
-    @Getter private Map<Integer, EntityMonster> summonTagMap;
+    @Getter private final Map<Integer, EntityMonster> summonTagMap;
     @Getter @Setter private int summonedTag;
     @Getter @Setter private int ownerEntityId;
     @Getter @Setter private int poseId;
     @Getter @Setter private int aiId = -1;
 
-    @Getter private List<Player> playerOnBattle;
+    @Getter private final List<Player> playerOnBattle;
     @Nullable @Getter @Setter private SceneMonster metaMonster;
 
     public EntityMonster(
diff --git a/src/main/java/emu/grasscutter/game/entity/EntityTeam.java b/src/main/java/emu/grasscutter/game/entity/EntityTeam.java
index 949b003ab..a7b541891 100644
--- a/src/main/java/emu/grasscutter/game/entity/EntityTeam.java
+++ b/src/main/java/emu/grasscutter/game/entity/EntityTeam.java
@@ -10,7 +10,7 @@ import it.unimi.dsi.fastutil.ints.*;
 
 public class EntityTeam extends GameEntity {
 
-    private Player player;
+    private final Player player;
 
     public EntityTeam(Player player) {
         super(player.getScene());
diff --git a/src/main/java/emu/grasscutter/game/entity/EntityVehicle.java b/src/main/java/emu/grasscutter/game/entity/EntityVehicle.java
index 88db87bfa..78a3df4ee 100644
--- a/src/main/java/emu/grasscutter/game/entity/EntityVehicle.java
+++ b/src/main/java/emu/grasscutter/game/entity/EntityVehicle.java
@@ -36,7 +36,7 @@ public class EntityVehicle extends EntityBaseGadget {
     @Getter private final int gadgetId;
 
     @Getter @Setter private float curStamina;
-    @Getter private List<VehicleMember> vehicleMembers;
+    @Getter private final List<VehicleMember> vehicleMembers;
     @Nullable @Getter private ConfigEntityGadget configGadget;
 
     public EntityVehicle(
diff --git a/src/main/java/emu/grasscutter/game/entity/EntityWorld.java b/src/main/java/emu/grasscutter/game/entity/EntityWorld.java
index 50692cd72..da6fbd7ae 100644
--- a/src/main/java/emu/grasscutter/game/entity/EntityWorld.java
+++ b/src/main/java/emu/grasscutter/game/entity/EntityWorld.java
@@ -8,7 +8,7 @@ import it.unimi.dsi.fastutil.ints.*;
 import lombok.Getter;
 
 public class EntityWorld extends GameEntity {
-    @Getter private World world;
+    @Getter private final World world;
 
     public EntityWorld(World world) {
         super(null);
diff --git a/src/main/java/emu/grasscutter/game/entity/GameEntity.java b/src/main/java/emu/grasscutter/game/entity/GameEntity.java
index 7e78dbb10..e3b9003ff 100644
--- a/src/main/java/emu/grasscutter/game/entity/GameEntity.java
+++ b/src/main/java/emu/grasscutter/game/entity/GameEntity.java
@@ -44,13 +44,13 @@ public abstract class GameEntity {
     @Getter @Setter private EntityController entityController;
     @Getter private ElementType lastAttackType = ElementType.None;
 
-    @Getter private List<Ability> instancedAbilities = new ArrayList<>();
+    @Getter private final List<Ability> instancedAbilities = new ArrayList<>();
 
     @Getter
-    private Int2ObjectMap<AbilityModifierController> instancedModifiers =
+    private final Int2ObjectMap<AbilityModifierController> instancedModifiers =
             new Int2ObjectOpenHashMap<>();
 
-    @Getter private Map<String, Float> globalAbilityValues = new HashMap<>();
+    @Getter private final Map<String, Float> globalAbilityValues = new HashMap<>();
 
     public GameEntity(Scene scene) {
         this.scene = scene;
diff --git a/src/main/java/emu/grasscutter/game/entity/gadget/GadgetAbility.java b/src/main/java/emu/grasscutter/game/entity/gadget/GadgetAbility.java
index 3fc91e587..6775ea4ca 100644
--- a/src/main/java/emu/grasscutter/game/entity/gadget/GadgetAbility.java
+++ b/src/main/java/emu/grasscutter/game/entity/gadget/GadgetAbility.java
@@ -8,7 +8,7 @@ import emu.grasscutter.net.proto.SceneGadgetInfoOuterClass.SceneGadgetInfo;
 import lombok.val;
 
 public class GadgetAbility extends GadgetContent {
-    private EntityBaseGadget parent;
+    private final EntityBaseGadget parent;
 
     public GadgetAbility(EntityGadget gadget, EntityBaseGadget parent) {
         super(gadget);
diff --git a/src/main/java/emu/grasscutter/game/friends/PlayerProfile.java b/src/main/java/emu/grasscutter/game/friends/PlayerProfile.java
index 6d150df5f..509914446 100644
--- a/src/main/java/emu/grasscutter/game/friends/PlayerProfile.java
+++ b/src/main/java/emu/grasscutter/game/friends/PlayerProfile.java
@@ -24,8 +24,8 @@ public class PlayerProfile {
     private int worldLevel;
     private int lastActiveTime;
 
-    private boolean isInDuel = false; // TODO: Implement duels. (TCG)
-    private boolean isDuelObservable = false; // TODO: Implement duels. (TCG)
+    private final boolean isInDuel = false; // TODO: Implement duels. (TCG)
+    private final boolean isDuelObservable = false; // TODO: Implement duels. (TCG)
 
     @Getter private int enterHomeOption;
 
diff --git a/src/main/java/emu/grasscutter/game/gacha/GachaBanner.java b/src/main/java/emu/grasscutter/game/gacha/GachaBanner.java
index b1bdaeef2..7d3405fab 100644
--- a/src/main/java/emu/grasscutter/game/gacha/GachaBanner.java
+++ b/src/main/java/emu/grasscutter/game/gacha/GachaBanner.java
@@ -39,24 +39,24 @@ public class GachaBanner {
     @Getter private String previewPrefabPath;
     @Getter private String titlePath;
     private int costItemId = 0;
-    private int costItemAmount = 1;
+    private final int costItemAmount = 1;
     private int costItemId10 = 0;
-    private int costItemAmount10 = 10;
-    @Getter private int beginTime = 0;
-    @Getter private int endTime = 1924992000;
-    @Getter private int gachaTimesLimit = Integer.MAX_VALUE;
-    @Getter private int[] rateUpItems4 = {};
-    @Getter private int[] rateUpItems5 = {};
+    private final int costItemAmount10 = 10;
+    @Getter private final int beginTime = 0;
+    @Getter private final int endTime = 1924992000;
+    @Getter private final int gachaTimesLimit = Integer.MAX_VALUE;
+    @Getter private final int[] rateUpItems4 = {};
+    @Getter private final int[] rateUpItems5 = {};
     // This now handles default values for the fields below
-    @Getter private BannerType bannerType = BannerType.STANDARD;
+    @Getter private final BannerType bannerType = BannerType.STANDARD;
     // These don't change between banner types (apart from Standard having three extra 4star avatars)
     @Getter
-    private int[] fallbackItems3 = {
+    private final int[] fallbackItems3 = {
         11301, 11302, 11306, 12301, 12302, 12305, 13303, 14301, 14302, 14304, 15301, 15302, 15304
     };
 
-    @Getter private int[] fallbackItems4Pool1 = DEFAULT_FALLBACK_ITEMS_4_POOL_1;
-    @Getter private int[] fallbackItems4Pool2 = DEFAULT_FALLBACK_ITEMS_4_POOL_2;
+    @Getter private final int[] fallbackItems4Pool1 = DEFAULT_FALLBACK_ITEMS_4_POOL_1;
+    @Getter private final int[] fallbackItems4Pool2 = DEFAULT_FALLBACK_ITEMS_4_POOL_2;
     // Different banner types have different defaults, see above for default values and the enum for
     // which are used where.
     @Getter private int[] fallbackItems5Pool1;
@@ -66,33 +66,33 @@ public class GachaBanner {
     private int eventChance4 = -1; // Chance to win a featured event item
     private int eventChance5 = -1; // Chance to win a featured event item
     //
-    @Getter private boolean removeC6FromPool = false;
+    @Getter private final boolean removeC6FromPool = false;
 
     @Getter
-    private boolean autoStripRateUpFromFallback =
+    private final boolean autoStripRateUpFromFallback =
             true; // Ensures that featured items won't "double dip" into the losing pool
 
-    private int[][] poolBalanceWeights4 = {
+    private final int[][] poolBalanceWeights4 = {
         {1, 255}, {17, 255}, {21, 10455}
     }; // Used to ensure that players won't go too many rolls without getting something from pool 1
     // (avatar) or pool 2 (weapon)
-    private int[][] poolBalanceWeights5 = {{1, 30}, {147, 150}, {181, 10230}};
-    @Getter private int wishMaxProgress = 2;
+    private final int[][] poolBalanceWeights5 = {{1, 30}, {147, 150}, {181, 10230}};
+    @Getter private final int wishMaxProgress = 2;
 
     // Deprecated fields that were tolerated in early May 2022 but have apparently still being
     // circulating in new custom configs
     // For now, throw up big scary errors on load telling people that they will be banned outright in
     // a future version
-    @Deprecated private int[] rateUpItems1 = {};
-    @Deprecated private int[] rateUpItems2 = {};
-    @Deprecated private int eventChance = -1;
-    @Deprecated private int costItem = 0;
-    @Deprecated private int softPity = -1;
-    @Deprecated private int hardPity = -1;
-    @Deprecated private int minItemType = -1;
-    @Deprecated private int maxItemType = -1;
+    @Deprecated private final int[] rateUpItems1 = {};
+    @Deprecated private final int[] rateUpItems2 = {};
+    @Deprecated private final int eventChance = -1;
+    @Deprecated private final int costItem = 0;
+    @Deprecated private final int softPity = -1;
+    @Deprecated private final int hardPity = -1;
+    @Deprecated private final int minItemType = -1;
+    @Deprecated private final int maxItemType = -1;
     @Getter private boolean deprecated = false;
-    @Getter private boolean disabled = false;
+    @Getter private final boolean disabled = false;
 
     private void warnDeprecated(String name, String replacement) {
         Grasscutter.getLogger()
diff --git a/src/main/java/emu/grasscutter/game/managers/mapmark/MapMark.java b/src/main/java/emu/grasscutter/game/managers/mapmark/MapMark.java
index 930737bda..6960a8595 100644
--- a/src/main/java/emu/grasscutter/game/managers/mapmark/MapMark.java
+++ b/src/main/java/emu/grasscutter/game/managers/mapmark/MapMark.java
@@ -11,9 +11,9 @@ public class MapMark {
     private int sceneId;
     private String name;
     private Position position;
-    private MapMarkPointType mapMarkPointType;
+    private final MapMarkPointType mapMarkPointType;
     private int monsterId;
-    private MapMarkFromType mapMarkFromType;
+    private final MapMarkFromType mapMarkFromType;
     private int questId;
 
     @Deprecated // Morhpia
diff --git a/src/main/java/emu/grasscutter/game/player/Player.java b/src/main/java/emu/grasscutter/game/player/Player.java
index 571da1f91..1f8c87c03 100644
--- a/src/main/java/emu/grasscutter/game/player/Player.java
+++ b/src/main/java/emu/grasscutter/game/player/Player.java
@@ -78,17 +78,17 @@ public class Player implements PlayerHook, FieldFetch {
     @Getter private String signature;
     @Getter private int headImage;
     @Getter private int nameCardId = 210001;
-    @Getter private Position position;
+    @Getter private final Position position;
     @Getter @Setter private Position prevPos;
     @Getter @Setter private Position prevPosForHome;
     @Getter @Setter private int prevScene;
-    @Getter private Position rotation;
+    @Getter private final Position rotation;
     @Getter private PlayerBirthday birthday;
     @Getter private PlayerCodex codex;
     @Getter @Setter private boolean showAvatars;
     @Getter @Setter private List<Integer> showAvatarList;
     @Getter @Setter private List<Integer> showNameCardList;
-    @Getter private Map<Integer, Integer> properties;
+    @Getter private final Map<Integer, Integer> properties;
     @Getter @Setter private int currentRealmId;
     @Getter @Setter private transient boolean isInEditMode;
     @Getter @Setter private int widgetId;
@@ -98,25 +98,25 @@ public class Player implements PlayerHook, FieldFetch {
     @Getter @Setter private boolean inGodMode;
     @Getter @Setter private boolean unlimitedStamina;
 
-    @Getter private Set<Integer> nameCardList;
-    @Getter private Set<Integer> flyCloakList;
-    @Getter private Set<Integer> costumeList;
-    @Getter private Set<Integer> personalLineList;
+    @Getter private final Set<Integer> nameCardList;
+    @Getter private final Set<Integer> flyCloakList;
+    @Getter private final Set<Integer> costumeList;
+    @Getter private final Set<Integer> personalLineList;
     @Getter @Setter private Set<Integer> rewardedLevels;
     @Getter @Setter private Set<Integer> homeRewardedLevels;
     @Getter @Setter private Set<Integer> realmList;
     @Getter @Setter private Set<Integer> seenRealmList;
-    @Getter private Set<Integer> unlockedForgingBlueprints;
-    @Getter private Set<Integer> unlockedCombines;
-    @Getter private Set<Integer> unlockedFurniture;
-    @Getter private Set<Integer> unlockedFurnitureSuite;
-    @Getter private Map<Long, ExpeditionInfo> expeditionInfo;
-    @Getter private Map<Integer, Integer> unlockedRecipies;
-    @Getter private List<ActiveForgeData> activeForges;
-    @Getter private Map<Integer, ActiveCookCompoundData> activeCookCompounds;
-    @Getter private Map<Integer, Integer> questGlobalVariables;
-    @Getter private Map<Integer, Integer> openStates;
-    @Getter private Map<Integer, Set<Integer>> sceneTags;
+    @Getter private final Set<Integer> unlockedForgingBlueprints;
+    @Getter private final Set<Integer> unlockedCombines;
+    @Getter private final Set<Integer> unlockedFurniture;
+    @Getter private final Set<Integer> unlockedFurnitureSuite;
+    @Getter private final Map<Long, ExpeditionInfo> expeditionInfo;
+    @Getter private final Map<Integer, Integer> unlockedRecipies;
+    @Getter private final List<ActiveForgeData> activeForges;
+    @Getter private final Map<Integer, ActiveCookCompoundData> activeCookCompounds;
+    @Getter private final Map<Integer, Integer> questGlobalVariables;
+    @Getter private final Map<Integer, Integer> openStates;
+    @Getter private final Map<Integer, Set<Integer>> sceneTags;
     @Getter @Setter private Map<Integer, Set<Integer>> unlockedSceneAreas;
     @Getter @Setter private Map<Integer, Set<Integer>> unlockedScenePoints;
     @Getter @Setter private List<Integer> chatEmojiIdList;
@@ -133,13 +133,13 @@ public class Player implements PlayerHook, FieldFetch {
     @Transient @Getter private int areaType = 0;
 
     // Player managers go here
-    @Getter private transient AvatarStorage avatars;
-    @Getter private transient Inventory inventory;
-    @Getter private transient FriendsList friendsList;
-    @Getter private transient MailHandler mailHandler;
-    @Getter private transient AbilityManager abilityManager;
-    @Getter private transient QuestManager questManager;
-    @Getter private transient TowerManager towerManager;
+    @Getter private final transient AvatarStorage avatars;
+    @Getter private final transient Inventory inventory;
+    @Getter private final transient FriendsList friendsList;
+    @Getter private final transient MailHandler mailHandler;
+    @Getter private final transient AbilityManager abilityManager;
+    @Getter private final transient QuestManager questManager;
+    @Getter private final transient TowerManager towerManager;
     @Getter private transient SotSManager sotsManager;
     @Getter private transient MapMarksManager mapMarksManager;
     @Getter private transient StaminaManager staminaManager;
@@ -152,10 +152,10 @@ public class Player implements PlayerHook, FieldFetch {
     @Getter private transient CookingManager cookingManager;
     @Getter private transient CookingCompoundManager cookingCompoundManager;
     @Getter private transient ActivityManager activityManager;
-    @Getter private transient PlayerBuffManager buffManager;
+    @Getter private final transient PlayerBuffManager buffManager;
     @Getter private transient PlayerProgressManager progressManager;
     @Getter private transient SatiationManager satiationManager;
-    @Getter private transient TalkManager talkManager;
+    @Getter private final transient TalkManager talkManager;
 
     @Getter @Setter private transient Position lastCheckedPosition = null;
 
@@ -164,9 +164,9 @@ public class Player implements PlayerHook, FieldFetch {
     private PlayerProfile playerProfile;  // Getter has null-check
     @Getter private TeamManager teamManager;
     private TowerData towerData;  // Getter has null-check
-    @Getter private PlayerGachaInfo gachaInfo;
+    @Getter private final PlayerGachaInfo gachaInfo;
     private PlayerCollectionRecords collectionRecordStore;  // Getter has null-check
-    @Getter private ArrayList<ShopLimit> shopLimit;
+    @Getter private final ArrayList<ShopLimit> shopLimit;
 
     @Getter private transient GameHome home;
 
@@ -194,11 +194,11 @@ public class Player implements PlayerHook, FieldFetch {
     @Getter @Setter private int nextResinRefresh;
     @Getter @Setter private int resinBuyCount;
     @Getter @Setter private int lastDailyReset;
-    @Getter private transient MpSettingType mpSetting = MpSettingType.MP_SETTING_TYPE_ENTER_AFTER_APPLY;
+    @Getter private final transient MpSettingType mpSetting = MpSettingType.MP_SETTING_TYPE_ENTER_AFTER_APPLY;
     @Getter private long playerGameTime = 540000; // 9 in-game hours. Present at the start of the game.
 
-    @Getter private PlayerProgress playerProgress;
-    @Getter private Set<Integer> activeQuestTimers;
+    @Getter private final PlayerProgress playerProgress;
+    @Getter private final Set<Integer> activeQuestTimers;
 
     @Getter @Setter private ElementType mainCharacterElement = ElementType.None;
 
diff --git a/src/main/java/emu/grasscutter/game/player/PlayerCodex.java b/src/main/java/emu/grasscutter/game/player/PlayerCodex.java
index 646ef22d1..4981d4794 100644
--- a/src/main/java/emu/grasscutter/game/player/PlayerCodex.java
+++ b/src/main/java/emu/grasscutter/game/player/PlayerCodex.java
@@ -14,14 +14,14 @@ public class PlayerCodex {
     @Transient private Player player;
 
     // itemId is not codexId!
-    @Getter private Set<Integer> unlockedWeapon;
-    @Getter private Map<Integer, Integer> unlockedAnimal;
-    @Getter private Set<Integer> unlockedMaterial;
-    @Getter private Set<Integer> unlockedBook;
-    @Getter private Set<Integer> unlockedTip;
-    @Getter private Set<Integer> unlockedView;
+    @Getter private final Set<Integer> unlockedWeapon;
+    @Getter private final Map<Integer, Integer> unlockedAnimal;
+    @Getter private final Set<Integer> unlockedMaterial;
+    @Getter private final Set<Integer> unlockedBook;
+    @Getter private final Set<Integer> unlockedTip;
+    @Getter private final Set<Integer> unlockedView;
     @Getter private Set<Integer> unlockedReliquary;
-    @Getter private Set<Integer> unlockedReliquarySuitCodex;
+    @Getter private final Set<Integer> unlockedReliquarySuitCodex;
 
     public PlayerCodex() {
         this.unlockedWeapon = new HashSet<>();
diff --git a/src/main/java/emu/grasscutter/game/player/PlayerProgress.java b/src/main/java/emu/grasscutter/game/player/PlayerProgress.java
index f66b957ef..43ce48554 100644
--- a/src/main/java/emu/grasscutter/game/player/PlayerProgress.java
+++ b/src/main/java/emu/grasscutter/game/player/PlayerProgress.java
@@ -14,21 +14,21 @@ import lombok.*;
 @Entity
 public class PlayerProgress {
     @Setter @Transient private Player player;
-    private Map<Integer, ItemEntry> itemHistory;
+    private final Map<Integer, ItemEntry> itemHistory;
 
     /*
      * A list of dungeon IDs which have been completed.
      * This only applies to one-time dungeons.
      */
-    private IntArrayList completedDungeons;
+    private final IntArrayList completedDungeons;
 
     // keep track of EXEC_ADD_QUEST_PROGRESS count, will be used in CONTENT_ADD_QUEST_PROGRESS
     // not sure where to put this, this should be saved to DB but not to individual quest, since
     // it will be hard to loop and compare
-    private Map<String, Integer> questProgressCountMap;
+    private final Map<String, Integer> questProgressCountMap;
 
-    private Map<Integer, ItemGiveRecord> itemGivings;
-    private Map<Integer, BargainRecord> bargains;
+    private final Map<Integer, ItemGiveRecord> itemGivings;
+    private final Map<Integer, BargainRecord> bargains;
 
     public PlayerProgress() {
         this.questProgressCountMap = new ConcurrentHashMap<>();
diff --git a/src/main/java/emu/grasscutter/game/player/TeamInfo.java b/src/main/java/emu/grasscutter/game/player/TeamInfo.java
index 794f36501..397682cde 100644
--- a/src/main/java/emu/grasscutter/game/player/TeamInfo.java
+++ b/src/main/java/emu/grasscutter/game/player/TeamInfo.java
@@ -10,7 +10,7 @@ import java.util.*;
 @Entity
 public final class TeamInfo {
     private String name;
-    private List<Integer> avatars;
+    private final List<Integer> avatars;
 
     public TeamInfo() {
         this.name = "";
diff --git a/src/main/java/emu/grasscutter/game/quest/QuestManager.java b/src/main/java/emu/grasscutter/game/quest/QuestManager.java
index 2ac3601ab..cdd40945d 100644
--- a/src/main/java/emu/grasscutter/game/quest/QuestManager.java
+++ b/src/main/java/emu/grasscutter/game/quest/QuestManager.java
@@ -26,7 +26,7 @@ public final class QuestManager extends BasePlayerManager {
     @Getter private final Player player;
 
     @Getter private final Int2ObjectMap<GameMainQuest> mainQuests;
-    @Getter private Int2ObjectMap<int[]> acceptProgressLists;
+    @Getter private final Int2ObjectMap<int[]> acceptProgressLists;
     @Getter private final List<Integer> loggedQuests;
 
     private long lastHourCheck = 0;
diff --git a/src/main/java/emu/grasscutter/game/world/Scene.java b/src/main/java/emu/grasscutter/game/world/Scene.java
index 98047d1fc..65fedff48 100644
--- a/src/main/java/emu/grasscutter/game/world/Scene.java
+++ b/src/main/java/emu/grasscutter/game/world/Scene.java
@@ -79,7 +79,7 @@ public class Scene {
     private final List<Runnable> afterLoadedCallbacks = new ArrayList<>();
     private final List<Runnable> afterHostInitCallbacks = new ArrayList<>();
 
-    @Getter private GameEntity sceneEntity;
+    @Getter private final GameEntity sceneEntity;
     @Getter private final ServerTaskScheduler scheduler;
 
     public Scene(World world, SceneData sceneData) {
diff --git a/src/main/java/emu/grasscutter/game/world/SceneGroupInstance.java b/src/main/java/emu/grasscutter/game/world/SceneGroupInstance.java
index fe443e234..a57dc5830 100644
--- a/src/main/java/emu/grasscutter/game/world/SceneGroupInstance.java
+++ b/src/main/java/emu/grasscutter/game/world/SceneGroupInstance.java
@@ -19,11 +19,11 @@ public final class SceneGroupInstance {
     @Getter private transient SceneGroup luaGroup;
     @Getter @Setter private int targetSuiteId;
     @Getter @Setter private int activeSuiteId;
-    @Getter private Set<Integer> deadEntities; // Config_ids
+    @Getter private final Set<Integer> deadEntities; // Config_ids
     private boolean isCached;
 
-    @Getter private Map<Integer, Integer> cachedGadgetStates;
-    @Getter private Map<String, Integer> cachedVariables;
+    @Getter private final Map<Integer, Integer> cachedGadgetStates;
+    @Getter private final Map<String, Integer> cachedVariables;
 
     @Getter @Setter private int lastTimeRefreshed;
 
diff --git a/src/main/java/emu/grasscutter/game/world/SpawnDataEntry.java b/src/main/java/emu/grasscutter/game/world/SpawnDataEntry.java
index 27865e1ae..8e903c469 100644
--- a/src/main/java/emu/grasscutter/game/world/SpawnDataEntry.java
+++ b/src/main/java/emu/grasscutter/game/world/SpawnDataEntry.java
@@ -33,10 +33,10 @@ public class SpawnDataEntry {
     }
 
     public static class GridBlockId {
-        @Getter private int sceneId;
-        @Getter private int scale;
-        @Getter private int x;
-        @Getter private int z;
+        @Getter private final int sceneId;
+        @Getter private final int scale;
+        @Getter private final int x;
+        @Getter private final int z;
 
         public GridBlockId(int sceneId, int scale, int x, int z) {
             this.sceneId = sceneId;
diff --git a/src/main/java/emu/grasscutter/game/world/World.java b/src/main/java/emu/grasscutter/game/world/World.java
index 434583f6f..f0ca384de 100644
--- a/src/main/java/emu/grasscutter/game/world/World.java
+++ b/src/main/java/emu/grasscutter/game/world/World.java
@@ -48,7 +48,7 @@ public class World implements Iterable<Player> {
     @Getter private final List<Player> players;
     @Getter private final Int2ObjectMap<Scene> scenes;
 
-    @Getter private EntityWorld entity;
+    @Getter private final EntityWorld entity;
     private int nextEntityId = 0;
     private int nextPeerId = 0;
     private int worldLevel;
diff --git a/src/main/java/emu/grasscutter/scripts/SceneScriptManager.java b/src/main/java/emu/grasscutter/scripts/SceneScriptManager.java
index 4e5229600..2a9776a1d 100644
--- a/src/main/java/emu/grasscutter/scripts/SceneScriptManager.java
+++ b/src/main/java/emu/grasscutter/scripts/SceneScriptManager.java
@@ -55,7 +55,7 @@ public class SceneScriptManager {
     private final Map<Integer, SceneGroupInstance> sceneGroupsInstances;
     private final Map<Integer, SceneGroupInstance> cachedSceneGroupsInstances;
     private ScriptMonsterTideService scriptMonsterTideService;
-    private ScriptMonsterSpawnService scriptMonsterSpawnService;
+    private final ScriptMonsterSpawnService scriptMonsterSpawnService;
     /** blockid - loaded groupSet */
     private final Map<Integer, Set<SceneGroup>> loadedGroupSetPerBlock;
 
diff --git a/src/main/java/emu/grasscutter/scripts/ScriptLoader.java b/src/main/java/emu/grasscutter/scripts/ScriptLoader.java
index de5e14b5c..eaea56215 100644
--- a/src/main/java/emu/grasscutter/scripts/ScriptLoader.java
+++ b/src/main/java/emu/grasscutter/scripts/ScriptLoader.java
@@ -29,12 +29,12 @@ public class ScriptLoader {
     @Getter private static ScriptLib scriptLib;
     @Getter private static LuaValue scriptLibLua;
     /** suggest GC to remove it if the memory is less */
-    private static Map<String, SoftReference<String>> scriptSources = new ConcurrentHashMap<>();
+    private static final Map<String, SoftReference<String>> scriptSources = new ConcurrentHashMap<>();
 
-    private static Map<String, SoftReference<CompiledScript>> scriptsCache =
+    private static final Map<String, SoftReference<CompiledScript>> scriptsCache =
             new ConcurrentHashMap<>();
     /** sceneId - SceneMeta */
-    private static Map<Integer, SoftReference<SceneMeta>> sceneMetaCache = new ConcurrentHashMap<>();
+    private static final Map<Integer, SoftReference<SceneMeta>> sceneMetaCache = new ConcurrentHashMap<>();
 
     private static final AtomicReference<Bindings> currentBindings = new AtomicReference<>(null);
     private static final AtomicReference<ScriptContext> currentContext = new AtomicReference<>(null);
diff --git a/src/main/java/emu/grasscutter/scripts/data/controller/EntityController.java b/src/main/java/emu/grasscutter/scripts/data/controller/EntityController.java
index 82b7c2a65..5256ae952 100644
--- a/src/main/java/emu/grasscutter/scripts/data/controller/EntityController.java
+++ b/src/main/java/emu/grasscutter/scripts/data/controller/EntityController.java
@@ -11,8 +11,8 @@ import org.luaj.vm2.*;
 public class EntityController {
     private static final Set<String> SERVER_CALLED = Set.of("OnBeHurt", "OnDie", "OnTimer");
 
-    private transient CompiledScript entityController;
-    private transient Bindings entityControllerBindings;
+    private final transient CompiledScript entityController;
+    private final transient Bindings entityControllerBindings;
 
     public EntityController(CompiledScript entityController, Bindings entityControllerBindings) {
         this.entityController = entityController;
diff --git a/src/main/java/emu/grasscutter/server/event/game/SceneBlockLoadedEvent.java b/src/main/java/emu/grasscutter/server/event/game/SceneBlockLoadedEvent.java
index 1155b018b..2eb711825 100644
--- a/src/main/java/emu/grasscutter/server/event/game/SceneBlockLoadedEvent.java
+++ b/src/main/java/emu/grasscutter/server/event/game/SceneBlockLoadedEvent.java
@@ -6,7 +6,7 @@ import lombok.*;
 
 @Getter
 public final class SceneBlockLoadedEvent extends ServerEvent {
-    private SceneBlock block;
+    private final SceneBlock block;
 
     public SceneBlockLoadedEvent(SceneBlock block) {
         super(Type.GAME);
diff --git a/src/main/java/emu/grasscutter/server/event/game/SceneMetaLoadEvent.java b/src/main/java/emu/grasscutter/server/event/game/SceneMetaLoadEvent.java
index 0e5768a00..c0ae72ba7 100644
--- a/src/main/java/emu/grasscutter/server/event/game/SceneMetaLoadEvent.java
+++ b/src/main/java/emu/grasscutter/server/event/game/SceneMetaLoadEvent.java
@@ -6,7 +6,7 @@ import lombok.*;
 
 @Getter
 public final class SceneMetaLoadEvent extends ServerEvent {
-    private Scene scene;
+    private final Scene scene;
     @Setter private boolean override;
 
     public SceneMetaLoadEvent(Scene scene) {