implements modifier, works correctly. does not spawn item or have correct icon

src/data/move.ts

@@ -15,7 +15,7 @@ import { ArenaTagType } from "./enums/arena-tag-type";
 import { UnswappableAbilityAbAttr, UncopiableAbilityAbAttr, UnsuppressableAbilityAbAttr, NoTransformAbilityAbAttr, BlockRecoilDamageAttr, BlockOneHitKOAbAttr, IgnoreContactAbAttr, MaxMultiHitAbAttr, applyAbAttrs, BlockNonDirectDamageAbAttr, applyPreSwitchOutAbAttrs, PreSwitchOutAbAttr, applyPostDefendAbAttrs, PostDefendContactApplyStatusEffectAbAttr, MoveAbilityBypassAbAttr, ReverseDrainAbAttr, FieldPreventExplosiveMovesAbAttr, ForceSwitchOutImmunityAbAttr } from "./ability";
 import { Abilities } from "./enums/abilities";
 import { allAbilities } from './ability';
-import { PokemonHeldItemModifier } from "../modifier/modifier";
+import { ExtendScreenModifier, PokemonHeldItemModifier } from "../modifier/modifier";
 import { BattlerIndex } from "../battle";
 import { Stat } from "./pokemon-stat";
 import { TerrainType } from "./terrain";
@@ -3035,8 +3035,13 @@ export class AddArenaTagAttr extends MoveEffectAttr {
     if (!super.apply(user, target, move, args))
       return false;
 
+    const turnCountHolder = new Utils.IntegerHolder(this.turnCount);
+
+    if ([ArenaTagType.REFLECT, ArenaTagType.LIGHT_SCREEN, ArenaTagType.AURORA_VEIL].includes(this.tagType))
+      user.scene.applyModifiers(ExtendScreenModifier, user.isPlayer(), user, turnCountHolder);
+
     if (move.chance < 0 || move.chance === 100 || user.randSeedInt(100) < move.chance) {
-      user.scene.arena.addTag(this.tagType, this.turnCount, move.id, user.id, (this.selfSideTarget ? user : target).isPlayer() ? ArenaTagSide.PLAYER : ArenaTagSide.ENEMY);
+      user.scene.arena.addTag(this.tagType, turnCountHolder.value, move.id, user.id, (this.selfSideTarget ? user : target).isPlayer() ? ArenaTagSide.PLAYER : ArenaTagSide.ENEMY);
       return true;
     }
 

src/modifier/modifier-type.ts

@@ -919,6 +919,9 @@ export const modifierTypes = {
     (type, _args) => new Modifiers.HealingBoosterModifier(type, 1.1), 'healing_charm'),
   CANDY_JAR: () => new ModifierType('Candy Jar', 'Increases the number of levels added by Rare Candy items by 1', (type, _args) => new Modifiers.LevelIncrementBoosterModifier(type)),
   
+  LIGHT_CLAY: () => new ModifierType('Light Clay', 'Aurora Veil, Light Screen, or Reflect lasts 8 turns instead of 5.',
+    (type, _args) => new Modifiers.ExtendScreenModifier(type), 'coin_case'),
+
   BERRY_POUCH: () => new ModifierType('Berry Pouch', 'Adds a 25% chance that a used berry will not be consumed',
     (type, _args) => new Modifiers.PreserveBerryModifier(type)),
 

src/modifier/modifier.ts

@@ -918,6 +918,35 @@ export class PreserveBerryModifier extends PersistentModifier {
   }
 }
 
+export class ExtendScreenModifier extends PersistentModifier {
+  constructor(type: ModifierType, stackCount?: integer) {
+    super(type, stackCount);
+  }
+
+  match(modifier: Modifier) {
+    return modifier instanceof ExtendScreenModifier;
+  }
+
+  clone() {
+    return new ExtendScreenModifier(this.type, this.stackCount);
+  }
+
+  shouldApply(args: any[]): boolean {
+    return super.shouldApply(args) && args[0] instanceof Pokemon && args[1] instanceof Utils.IntegerHolder;
+  }
+
+  apply(args: any[]): boolean {
+    if ((args[1] as Utils.IntegerHolder).value)
+      (args[1] as Utils.IntegerHolder).value = (args[1] as Utils.IntegerHolder).value + 3;
+
+    return true;
+  }
+
+  getMaxStackCount(scene: BattleScene): integer {
+    return 1;
+  }
+}
+
 export class PokemonInstantReviveModifier extends PokemonHeldItemModifier {
   constructor(type: ModifierType, pokemonId: integer, stackCount?: integer) {
     super(type, pokemonId, stackCount);