diff --git a/src/data/arena-tag.ts b/src/data/arena-tag.ts
index 6407e139a71..45d64249296 100644
--- a/src/data/arena-tag.ts
+++ b/src/data/arena-tag.ts
@@ -28,20 +28,13 @@ export enum ArenaTagSide {
 }
 
 export abstract class ArenaTag {
-  public tagType: ArenaTagType;
-  public turnCount: integer;
-  public sourceMove?: Moves;
-  public sourceId?: integer;
-  public side: ArenaTagSide;
-
-
-  constructor(tagType: ArenaTagType, turnCount: integer, sourceMove: Moves | undefined, sourceId?: integer, side: ArenaTagSide = ArenaTagSide.BOTH) {
-    this.tagType = tagType;
-    this.turnCount = turnCount;
-    this.sourceMove = sourceMove;
-    this.sourceId = sourceId;
-    this.side = side;
-  }
+  constructor(
+    public tagType: ArenaTagType,
+    public turnCount: number,
+    public sourceMove?: Moves,
+    public sourceId?: number,
+    public side: ArenaTagSide = ArenaTagSide.BOTH
+  ) {}
 
   apply(arena: Arena, args: any[]): boolean {
     return true;
@@ -66,6 +59,18 @@ export abstract class ArenaTag {
       ? allMoves[this.sourceMove].name
       : null;
   }
+
+  /**
+   * When given a arena tag or json representing one, load the data for it.
+   * This is meant to be inherited from by any arena tag with custom attributes
+   * @param {ArenaTag | any} source An arena tag
+   */
+  loadTag(source : ArenaTag | any) : void {
+    this.turnCount = source.turnCount;
+    this.sourceMove = source.sourceMove;
+    this.sourceId = source.sourceId;
+    this.side = source.side;
+  }
 }
 
 /**
@@ -73,7 +78,7 @@ export abstract class ArenaTag {
  * Prevents Pokémon on the opposing side from lowering the stats of the Pokémon in the Mist.
  */
 export class MistTag extends ArenaTag {
-  constructor(turnCount: integer, sourceId: integer, side: ArenaTagSide) {
+  constructor(turnCount: number, sourceId: number, side: ArenaTagSide) {
     super(ArenaTagType.MIST, turnCount, Moves.MIST, sourceId, side);
   }
 
@@ -117,7 +122,7 @@ export class WeakenMoveScreenTag extends ArenaTag {
    * @param side - The side (player or enemy) the tag affects.
    * @param weakenedCategories - The categories of moves that are weakened by this tag.
    */
-  constructor(tagType: ArenaTagType, turnCount: integer, sourceMove: Moves, sourceId: integer, side: ArenaTagSide, weakenedCategories: MoveCategory[]) {
+  constructor(tagType: ArenaTagType, turnCount: number, sourceMove: Moves, sourceId: number, side: ArenaTagSide, weakenedCategories: MoveCategory[]) {
     super(tagType, turnCount, sourceMove, sourceId, side);
 
     this.weakenedCategories = weakenedCategories;
@@ -148,7 +153,7 @@ export class WeakenMoveScreenTag extends ArenaTag {
  * Used by {@linkcode Moves.REFLECT}
  */
 class ReflectTag extends WeakenMoveScreenTag {
-  constructor(turnCount: integer, sourceId: integer, side: ArenaTagSide) {
+  constructor(turnCount: number, sourceId: number, side: ArenaTagSide) {
     super(ArenaTagType.REFLECT, turnCount, Moves.REFLECT, sourceId, side, [ MoveCategory.PHYSICAL ]);
   }
 
@@ -164,7 +169,7 @@ class ReflectTag extends WeakenMoveScreenTag {
  * Used by {@linkcode Moves.LIGHT_SCREEN}
  */
 class LightScreenTag extends WeakenMoveScreenTag {
-  constructor(turnCount: integer, sourceId: integer, side: ArenaTagSide) {
+  constructor(turnCount: number, sourceId: number, side: ArenaTagSide) {
     super(ArenaTagType.LIGHT_SCREEN, turnCount, Moves.LIGHT_SCREEN, sourceId, side, [ MoveCategory.SPECIAL ]);
   }
 
@@ -180,7 +185,7 @@ class LightScreenTag extends WeakenMoveScreenTag {
  * Used by {@linkcode Moves.AURORA_VEIL}
  */
 class AuroraVeilTag extends WeakenMoveScreenTag {
-  constructor(turnCount: integer, sourceId: integer, side: ArenaTagSide) {
+  constructor(turnCount: number, sourceId: number, side: ArenaTagSide) {
     super(ArenaTagType.AURORA_VEIL, turnCount, Moves.AURORA_VEIL, sourceId, side, [ MoveCategory.SPECIAL, MoveCategory.PHYSICAL ]);
   }
 
@@ -203,7 +208,7 @@ export class ConditionalProtectTag extends ArenaTag {
   /** Does this apply to all moves, including those that ignore other forms of protection? */
   protected ignoresBypass: boolean;
 
-  constructor(tagType: ArenaTagType, sourceMove: Moves, sourceId: integer, side: ArenaTagSide, condition: ProtectConditionFunc, ignoresBypass: boolean = false) {
+  constructor(tagType: ArenaTagType, sourceMove: Moves, sourceId: number, side: ArenaTagSide, condition: ProtectConditionFunc, ignoresBypass: boolean = false) {
     super(tagType, 1, sourceMove, sourceId, side);
 
     this.protectConditionFunc = condition;
@@ -265,7 +270,7 @@ export class ConditionalProtectTag extends ArenaTag {
  */
 const QuickGuardConditionFunc: ProtectConditionFunc = (arena, moveId) => {
   const move = allMoves[moveId];
-  const priority = new Utils.IntegerHolder(move.priority);
+  const priority = new Utils.NumberHolder(move.priority);
   const effectPhase = arena.scene.getCurrentPhase();
 
   if (effectPhase instanceof MoveEffectPhase) {
@@ -281,7 +286,7 @@ const QuickGuardConditionFunc: ProtectConditionFunc = (arena, moveId) => {
  * Condition: The incoming move has increased priority.
  */
 class QuickGuardTag extends ConditionalProtectTag {
-  constructor(sourceId: integer, side: ArenaTagSide) {
+  constructor(sourceId: number, side: ArenaTagSide) {
     super(ArenaTagType.QUICK_GUARD, Moves.QUICK_GUARD, sourceId, side, QuickGuardConditionFunc);
   }
 }
@@ -312,7 +317,7 @@ const WideGuardConditionFunc: ProtectConditionFunc = (arena, moveId) : boolean =
  * can be an ally or enemy.
  */
 class WideGuardTag extends ConditionalProtectTag {
-  constructor(sourceId: integer, side: ArenaTagSide) {
+  constructor(sourceId: number, side: ArenaTagSide) {
     super(ArenaTagType.WIDE_GUARD, Moves.WIDE_GUARD, sourceId, side, WideGuardConditionFunc);
   }
 }
@@ -334,7 +339,7 @@ const MatBlockConditionFunc: ProtectConditionFunc = (arena, moveId) : boolean =>
  * Condition: The incoming move is a Physical or Special attack move.
  */
 class MatBlockTag extends ConditionalProtectTag {
-  constructor(sourceId: integer, side: ArenaTagSide) {
+  constructor(sourceId: number, side: ArenaTagSide) {
     super(ArenaTagType.MAT_BLOCK, Moves.MAT_BLOCK, sourceId, side, MatBlockConditionFunc);
   }
 
@@ -372,7 +377,7 @@ const CraftyShieldConditionFunc: ProtectConditionFunc = (arena, moveId) => {
  * not target all Pokemon or sides of the field.
 */
 class CraftyShieldTag extends ConditionalProtectTag {
-  constructor(sourceId: integer, side: ArenaTagSide) {
+  constructor(sourceId: number, side: ArenaTagSide) {
     super(ArenaTagType.CRAFTY_SHIELD, Moves.CRAFTY_SHIELD, sourceId, side, CraftyShieldConditionFunc, true);
   }
 }
@@ -384,12 +389,12 @@ class CraftyShieldTag extends ConditionalProtectTag {
 export class NoCritTag extends ArenaTag {
   /**
    * Constructor method for the NoCritTag class
-   * @param turnCount `integer` the number of turns this effect lasts
+   * @param turnCount `number` the number of turns this effect lasts
    * @param sourceMove {@linkcode Moves} the move that created this effect
-   * @param sourceId `integer` the ID of the {@linkcode Pokemon} that created this effect
+   * @param sourceId `number` the ID of the {@linkcode Pokemon} that created this effect
    * @param side {@linkcode ArenaTagSide} the side to which this effect belongs
    */
-  constructor(turnCount: integer, sourceMove: Moves, sourceId: integer, side: ArenaTagSide) {
+  constructor(turnCount: number, sourceMove: Moves, sourceId: number, side: ArenaTagSide) {
     super(ArenaTagType.NO_CRIT, turnCount, sourceMove, sourceId, side);
   }
 
@@ -419,7 +424,7 @@ class WishTag extends ArenaTag {
   private triggerMessage: string;
   private healHp: number;
 
-  constructor(turnCount: integer, sourceId: integer, side: ArenaTagSide) {
+  constructor(turnCount: number, sourceId: number, side: ArenaTagSide) {
     super(ArenaTagType.WISH, turnCount, Moves.WISH, sourceId, side);
   }
 
@@ -460,7 +465,7 @@ export class WeakenMoveTypeTag extends ArenaTag {
    * @param sourceMove - The move that created the tag.
    * @param sourceId - The ID of the source of the tag.
    */
-  constructor(tagType: ArenaTagType, turnCount: integer, type: Type, sourceMove: Moves, sourceId: integer) {
+  constructor(tagType: ArenaTagType, turnCount: number, type: Type, sourceMove: Moves, sourceId: number) {
     super(tagType, turnCount, sourceMove, sourceId);
 
     this.weakenedType = type;
@@ -481,7 +486,7 @@ export class WeakenMoveTypeTag extends ArenaTag {
  * Weakens Electric type moves for a set amount of turns, usually 5.
  */
 class MudSportTag extends WeakenMoveTypeTag {
-  constructor(turnCount: integer, sourceId: integer) {
+  constructor(turnCount: number, sourceId: number) {
     super(ArenaTagType.MUD_SPORT, turnCount, Type.ELECTRIC, Moves.MUD_SPORT, sourceId);
   }
 
@@ -499,7 +504,7 @@ class MudSportTag extends WeakenMoveTypeTag {
  * Weakens Fire type moves for a set amount of turns, usually 5.
  */
 class WaterSportTag extends WeakenMoveTypeTag {
-  constructor(turnCount: integer, sourceId: integer) {
+  constructor(turnCount: number, sourceId: number) {
     super(ArenaTagType.WATER_SPORT, turnCount, Type.FIRE, Moves.WATER_SPORT, sourceId);
   }
 
@@ -550,8 +555,8 @@ export class IonDelugeTag extends ArenaTag {
  * Abstract class to implement arena traps.
  */
 export class ArenaTrapTag extends ArenaTag {
-  public layers: integer;
-  public maxLayers: integer;
+  public layers: number;
+  public maxLayers: number;
 
   /**
    * Creates a new instance of the ArenaTrapTag class.
@@ -562,7 +567,7 @@ export class ArenaTrapTag extends ArenaTag {
    * @param side - The side (player or enemy) the tag affects.
    * @param maxLayers - The maximum amount of layers this tag can have.
    */
-  constructor(tagType: ArenaTagType, sourceMove: Moves, sourceId: integer, side: ArenaTagSide, maxLayers: integer) {
+  constructor(tagType: ArenaTagType, sourceMove: Moves, sourceId: number, side: ArenaTagSide, maxLayers: number) {
     super(tagType, 0, sourceMove, sourceId, side);
 
     this.layers = 1;
@@ -593,6 +598,12 @@ export class ArenaTrapTag extends ArenaTag {
   getMatchupScoreMultiplier(pokemon: Pokemon): number {
     return pokemon.isGrounded() ? 1 : Phaser.Math.Linear(0, 1 / Math.pow(2, this.layers), Math.min(pokemon.getHpRatio(), 0.5) * 2);
   }
+
+  loadTag(source: any): void {
+    super.loadTag(source);
+    this.layers = source.layers;
+    this.maxLayers = source.maxLayers;
+  }
 }
 
 /**
@@ -601,7 +612,7 @@ export class ArenaTrapTag extends ArenaTag {
  * in damage for 1, 2, or 3 layers of Spikes respectively if they are summoned into this trap.
  */
 class SpikesTag extends ArenaTrapTag {
-  constructor(sourceId: integer, side: ArenaTagSide) {
+  constructor(sourceId: number, side: ArenaTagSide) {
     super(ArenaTagType.SPIKES, Moves.SPIKES, sourceId, side, 3);
   }
 
@@ -645,7 +656,7 @@ class SpikesTag extends ArenaTrapTag {
 class ToxicSpikesTag extends ArenaTrapTag {
   private neutralized: boolean;
 
-  constructor(sourceId: integer, side: ArenaTagSide) {
+  constructor(sourceId: number, side: ArenaTagSide) {
     super(ArenaTagType.TOXIC_SPIKES, Moves.TOXIC_SPIKES, sourceId, side, 2);
     this.neutralized = false;
   }
@@ -703,7 +714,7 @@ class ToxicSpikesTag extends ArenaTrapTag {
 class DelayedAttackTag extends ArenaTag {
   public targetIndex: BattlerIndex;
 
-  constructor(tagType: ArenaTagType, sourceMove: Moves | undefined, sourceId: integer, targetIndex: BattlerIndex) {
+  constructor(tagType: ArenaTagType, sourceMove: Moves | undefined, sourceId: number, targetIndex: BattlerIndex) {
     super(tagType, 3, sourceMove, sourceId);
 
     this.targetIndex = targetIndex;
@@ -728,7 +739,7 @@ class DelayedAttackTag extends ArenaTag {
  * who is summoned into the trap, based on the Rock type's type effectiveness.
  */
 class StealthRockTag extends ArenaTrapTag {
-  constructor(sourceId: integer, side: ArenaTagSide) {
+  constructor(sourceId: number, side: ArenaTagSide) {
     super(ArenaTagType.STEALTH_ROCK, Moves.STEALTH_ROCK, sourceId, side, 1);
   }
 
@@ -804,7 +815,7 @@ class StealthRockTag extends ArenaTrapTag {
  * to any Pokémon who is summoned into this trap.
  */
 class StickyWebTag extends ArenaTrapTag {
-  constructor(sourceId: integer, side: ArenaTagSide) {
+  constructor(sourceId: number, side: ArenaTagSide) {
     super(ArenaTagType.STICKY_WEB, Moves.STICKY_WEB, sourceId, side, 1);
   }
 
@@ -838,7 +849,7 @@ class StickyWebTag extends ArenaTrapTag {
  * also reversing the turn order for all Pokémon on the field as well.
  */
 export class TrickRoomTag extends ArenaTag {
-  constructor(turnCount: integer, sourceId: integer) {
+  constructor(turnCount: number, sourceId: number) {
     super(ArenaTagType.TRICK_ROOM, turnCount, Moves.TRICK_ROOM, sourceId);
   }
 
@@ -866,7 +877,7 @@ export class TrickRoomTag extends ArenaTag {
  * {@linkcode Abilities.LEVITATE} for the duration of the arena tag, usually 5 turns.
  */
 export class GravityTag extends ArenaTag {
-  constructor(turnCount: integer) {
+  constructor(turnCount: number) {
     super(ArenaTagType.GRAVITY, turnCount, Moves.GRAVITY);
   }
 
@@ -890,7 +901,7 @@ export class GravityTag extends ArenaTag {
  * Applies this arena tag for 4 turns (including the turn the move was used).
  */
 class TailwindTag extends ArenaTag {
-  constructor(turnCount: integer, sourceId: integer, side: ArenaTagSide) {
+  constructor(turnCount: number, sourceId: number, side: ArenaTagSide) {
     super(ArenaTagType.TAILWIND, turnCount, Moves.TAILWIND, sourceId, side);
   }
 
@@ -928,7 +939,7 @@ class TailwindTag extends ArenaTag {
  * Doubles the prize money from trainers and money moves like {@linkcode Moves.PAY_DAY} and {@linkcode Moves.MAKE_IT_RAIN}.
  */
 class HappyHourTag extends ArenaTag {
-  constructor(turnCount: integer, sourceId: integer, side: ArenaTagSide) {
+  constructor(turnCount: number, sourceId: number, side: ArenaTagSide) {
     super(ArenaTagType.HAPPY_HOUR, turnCount, Moves.HAPPY_HOUR, sourceId, side);
   }
 
@@ -942,7 +953,7 @@ class HappyHourTag extends ArenaTag {
 }
 
 class SafeguardTag extends ArenaTag {
-  constructor(turnCount: integer, sourceId: integer, side: ArenaTagSide) {
+  constructor(turnCount: number, sourceId: number, side: ArenaTagSide) {
     super(ArenaTagType.SAFEGUARD, turnCount, Moves.SAFEGUARD, sourceId, side);
   }
 
@@ -955,6 +966,11 @@ class SafeguardTag extends ArenaTag {
   }
 }
 
+class NoneTag extends ArenaTag {
+  constructor() {
+    super(ArenaTagType.NONE, 0);
+  }
+}
 /**
  * This arena tag facilitates the application of the move Imprison
  * Imprison remains in effect as long as the source Pokemon is active and present on the field.
@@ -1102,7 +1118,8 @@ class GrassWaterPledgeTag extends ArenaTag {
   }
 }
 
-export function getArenaTag(tagType: ArenaTagType, turnCount: integer, sourceMove: Moves | undefined, sourceId: integer, targetIndex?: BattlerIndex, side: ArenaTagSide = ArenaTagSide.BOTH): ArenaTag | null {
+// TODO: swap `sourceMove` and `sourceId` and make `sourceMove` an optional parameter
+export function getArenaTag(tagType: ArenaTagType, turnCount: number, sourceMove: Moves | undefined, sourceId: number, targetIndex?: BattlerIndex, side: ArenaTagSide = ArenaTagSide.BOTH): ArenaTag | null {
   switch (tagType) {
   case ArenaTagType.MIST:
     return new MistTag(turnCount, sourceId, side);
@@ -1163,3 +1180,16 @@ export function getArenaTag(tagType: ArenaTagType, turnCount: integer, sourceMov
     return null;
   }
 }
+
+/**
+ * When given a battler tag or json representing one, creates an actual ArenaTag object with the same data.
+ * @param {ArenaTag | any} source An arena tag
+ * @return {ArenaTag} The valid arena tag
+ */
+export function loadArenaTag(source: ArenaTag | any): ArenaTag {
+  const tag = getArenaTag(source.tagType, source.turnCount, source.sourceMove, source.sourceId, source.targetIndex, source.side)
+      ?? new NoneTag();
+  tag.loadTag(source);
+  return tag;
+}
+
diff --git a/src/phases/check-status-effect-phase.ts b/src/phases/check-status-effect-phase.ts
new file mode 100644
index 00000000000..44918b54966
--- /dev/null
+++ b/src/phases/check-status-effect-phase.ts
@@ -0,0 +1,23 @@
+import { PostTurnStatusEffectPhase } from "#app/phases/post-turn-status-effect-phase";
+import { Phase } from "#app/phase";
+import { BattlerIndex } from "#app/battle";
+import BattleScene from "#app/battle-scene";
+
+export class CheckStatusEffectPhase extends Phase {
+  private order : BattlerIndex[];
+  constructor(scene : BattleScene, order : BattlerIndex[]) {
+    super(scene);
+    this.scene = scene;
+    this.order = order;
+  }
+
+  start() {
+    const field = this.scene.getField();
+    for (const o of this.order) {
+      if (field[o].status && field[o].status.isPostTurn()) {
+        this.scene.unshiftPhase(new PostTurnStatusEffectPhase(this.scene, o));
+      }
+    }
+    this.end();
+  }
+}
diff --git a/src/phases/obtain-status-effect-phase.ts b/src/phases/obtain-status-effect-phase.ts
index bf38c432394..c396fa7ba59 100644
--- a/src/phases/obtain-status-effect-phase.ts
+++ b/src/phases/obtain-status-effect-phase.ts
@@ -6,7 +6,6 @@ import { StatusEffect } from "#app/enums/status-effect";
 import Pokemon from "#app/field/pokemon";
 import { getPokemonNameWithAffix } from "#app/messages";
 import { PokemonPhase } from "./pokemon-phase";
-import { PostTurnStatusEffectPhase } from "./post-turn-status-effect-phase";
 
 export class ObtainStatusEffectPhase extends PokemonPhase {
   private statusEffect?: StatusEffect | undefined;
@@ -33,9 +32,6 @@ export class ObtainStatusEffectPhase extends PokemonPhase {
         pokemon.updateInfo(true);
         new CommonBattleAnim(CommonAnim.POISON + (this.statusEffect! - 1), pokemon).play(this.scene, false, () => {
           this.scene.queueMessage(getStatusEffectObtainText(this.statusEffect, getPokemonNameWithAffix(pokemon), this.sourceText ?? undefined));
-          if (pokemon.status?.isPostTurn()) {
-            this.scene.pushPhase(new PostTurnStatusEffectPhase(this.scene, this.battlerIndex));
-          }
           this.end();
         });
         return;
diff --git a/src/phases/turn-start-phase.ts b/src/phases/turn-start-phase.ts
index 53623f933f2..627cee4b06a 100644
--- a/src/phases/turn-start-phase.ts
+++ b/src/phases/turn-start-phase.ts
@@ -13,10 +13,10 @@ import { BerryPhase } from "./berry-phase";
 import { FieldPhase } from "./field-phase";
 import { MoveHeaderPhase } from "./move-header-phase";
 import { MovePhase } from "./move-phase";
-import { PostTurnStatusEffectPhase } from "./post-turn-status-effect-phase";
 import { SwitchSummonPhase } from "./switch-summon-phase";
 import { TurnEndPhase } from "./turn-end-phase";
 import { WeatherEffectPhase } from "./weather-effect-phase";
+import { CheckStatusEffectPhase } from "#app/phases/check-status-effect-phase";
 import { BattlerIndex } from "#app/battle";
 import { TrickRoomTag } from "#app/data/arena-tag";
 import { SwitchType } from "#enums/switch-type";
@@ -206,11 +206,8 @@ export class TurnStartPhase extends FieldPhase {
 
     this.scene.pushPhase(new WeatherEffectPhase(this.scene));
 
-    for (const o of moveOrder) {
-      if (field[o].status && field[o].status.isPostTurn()) {
-        this.scene.pushPhase(new PostTurnStatusEffectPhase(this.scene, o));
-      }
-    }
+    /** Add a new phase to check who should be taking status damage */
+    this.scene.pushPhase(new CheckStatusEffectPhase(this.scene, moveOrder));
 
     this.scene.pushPhase(new BerryPhase(this.scene));
     this.scene.pushPhase(new TurnEndPhase(this.scene));
diff --git a/src/system/arena-data.ts b/src/system/arena-data.ts
index 5b907805372..ba37de0ed0e 100644
--- a/src/system/arena-data.ts
+++ b/src/system/arena-data.ts
@@ -1,5 +1,5 @@
 import { Arena } from "../field/arena";
-import { ArenaTag } from "../data/arena-tag";
+import { ArenaTag, loadArenaTag } from "../data/arena-tag";
 import { Biome } from "#enums/biome";
 import { Weather } from "../data/weather";
 import { Terrain } from "#app/data/terrain";
@@ -15,6 +15,10 @@ export default class ArenaData {
     this.biome = sourceArena ? sourceArena.biomeType : source.biome;
     this.weather = sourceArena ? sourceArena.weather : source.weather ? new Weather(source.weather.weatherType, source.weather.turnsLeft) : null;
     this.terrain = sourceArena ? sourceArena.terrain : source.terrain ? new Terrain(source.terrain.terrainType, source.terrain.turnsLeft) : null;
-    this.tags = sourceArena ? sourceArena.tags : [];
+    this.tags = [];
+
+    if (source.tags) {
+      this.tags = source.tags.map(t => loadArenaTag(t));
+    }
   }
 }
diff --git a/src/system/game-data.ts b/src/system/game-data.ts
index 0d2f35ae728..b162962fac6 100644
--- a/src/system/game-data.ts
+++ b/src/system/game-data.ts
@@ -31,7 +31,7 @@ import { TrainerVariant } from "#app/field/trainer";
 import { Variant } from "#app/data/variant";
 import { setSettingGamepad, SettingGamepad, settingGamepadDefaults } from "#app/system/settings/settings-gamepad";
 import { setSettingKeyboard, SettingKeyboard } from "#app/system/settings/settings-keyboard";
-import { TerrainChangedEvent, WeatherChangedEvent } from "#app/events/arena";
+import { TagAddedEvent, TerrainChangedEvent, WeatherChangedEvent } from "#app/events/arena";
 import * as Modifier from "#app/modifier/modifier";
 import { StatusEffect } from "#app/data/status-effect";
 import ChallengeData from "#app/system/challenge-data";
@@ -50,6 +50,7 @@ import { applySessionDataPatches, applySettingsDataPatches, applySystemDataPatch
 import { MysteryEncounterSaveData } from "#app/data/mystery-encounters/mystery-encounter-save-data";
 import { MysteryEncounterType } from "#enums/mystery-encounter-type";
 import { PokerogueApiClearSessionData } from "#app/@types/pokerogue-api";
+import { ArenaTrapTag } from "#app/data/arena-tag";
 
 export const defaultStarterSpecies: Species[] = [
   Species.BULBASAUR, Species.CHARMANDER, Species.SQUIRTLE,
@@ -1085,8 +1086,18 @@ export class GameData {
 
           scene.arena.terrain = sessionData.arena.terrain;
           scene.arena.eventTarget.dispatchEvent(new TerrainChangedEvent(TerrainType.NONE, scene.arena.terrain?.terrainType!, scene.arena.terrain?.turnsLeft!)); // TODO: is this bang correct?
-          // TODO
-          //scene.arena.tags = sessionData.arena.tags;
+
+          scene.arena.tags = sessionData.arena.tags;
+          if (scene.arena.tags) {
+            for (const tag of scene.arena.tags) {
+              if (tag instanceof ArenaTrapTag) {
+                const { tagType, side, turnCount, layers, maxLayers } = tag as ArenaTrapTag;
+                scene.arena.eventTarget.dispatchEvent(new TagAddedEvent(tagType, side, turnCount, layers, maxLayers));
+              } else {
+                scene.arena.eventTarget.dispatchEvent(new TagAddedEvent(tag.tagType, tag.side, tag.turnCount));
+              }
+            }
+          }
 
           for (const modifierData of sessionData.modifiers) {
             const modifier = modifierData.toModifier(scene, Modifier[modifierData.className]);
diff --git a/src/test/items/toxic_orb.test.ts b/src/test/items/toxic_orb.test.ts
index a83fd3655e5..63c7b6245f5 100644
--- a/src/test/items/toxic_orb.test.ts
+++ b/src/test/items/toxic_orb.test.ts
@@ -1,7 +1,4 @@
 import { StatusEffect } from "#app/data/status-effect";
-import { EnemyCommandPhase } from "#app/phases/enemy-command-phase";
-import { MessagePhase } from "#app/phases/message-phase";
-import { TurnEndPhase } from "#app/phases/turn-end-phase";
 import i18next from "#app/plugins/i18n";
 import { Abilities } from "#enums/abilities";
 import { Moves } from "#enums/moves";
@@ -10,6 +7,7 @@ import GameManager from "#test/utils/gameManager";
 import Phaser from "phaser";
 import { afterEach, beforeAll, beforeEach, describe, expect, it, vi } from "vitest";
 
+const TIMEOUT = 20 * 1000;
 
 describe("Items - Toxic orb", () => {
   let phaserGame: Phaser.Game;
@@ -27,40 +25,36 @@ describe("Items - Toxic orb", () => {
 
   beforeEach(() => {
     game = new GameManager(phaserGame);
-    const moveToUse = Moves.GROWTH;
-    const oppMoveToUse = Moves.TACKLE;
-    game.override.battleType("single");
-    game.override.enemySpecies(Species.RATTATA);
-    game.override.ability(Abilities.INSOMNIA);
-    game.override.enemyAbility(Abilities.INSOMNIA);
-    game.override.startingLevel(2000);
-    game.override.moveset([ moveToUse ]);
-    game.override.enemyMoveset([ oppMoveToUse, oppMoveToUse, oppMoveToUse, oppMoveToUse ]);
-    game.override.startingHeldItems([{
-      name: "TOXIC_ORB",
-    }]);
+    game.override
+      .battleType("single")
+      .enemySpecies(Species.RATTATA)
+      .ability(Abilities.BALL_FETCH)
+      .enemyAbility(Abilities.BALL_FETCH)
+      .moveset([ Moves.SPLASH ])
+      .enemyMoveset(Moves.SPLASH)
+      .startingHeldItems([{
+        name: "TOXIC_ORB",
+      }]);
 
     vi.spyOn(i18next, "t");
   });
 
-  it("TOXIC ORB", async () => {
-    const moveToUse = Moves.GROWTH;
-    await game.startBattle([
-      Species.MIGHTYENA,
-      Species.MIGHTYENA,
-    ]);
-    expect(game.scene.modifiers[0].type.id).toBe("TOXIC_ORB");
+  it("badly poisons the holder", async () => {
+    await game.classicMode.startBattle([ Species.MIGHTYENA ]);
 
-    game.move.select(moveToUse);
+    const player = game.scene.getPlayerField()[0];
 
-    // will run the 13 phase from enemyCommandPhase to TurnEndPhase
-    await game.phaseInterceptor.runFrom(EnemyCommandPhase).to(TurnEndPhase);
+    game.move.select(Moves.SPLASH);
+
+    await game.phaseInterceptor.to("TurnEndPhase");
     // Toxic orb should trigger here
-    await game.phaseInterceptor.run(MessagePhase);
+    await game.phaseInterceptor.run("MessagePhase");
     expect(i18next.t).toHaveBeenCalledWith("statusEffect:toxic.obtainSource", expect.anything());
 
-    await game.phaseInterceptor.run(MessagePhase);
-    expect(i18next.t).toHaveBeenCalledWith("statusEffect:toxic.activation", expect.anything());
-    expect(game.scene.getParty()[0].status!.effect).toBe(StatusEffect.TOXIC);
-  }, 20000);
+    await game.toNextTurn();
+
+    expect(player.status?.effect).toBe(StatusEffect.TOXIC);
+    // Damage should not have ticked yet.
+    expect(player.status?.turnCount).toBe(0);
+  }, TIMEOUT);
 });
diff --git a/src/test/moves/toxic_spikes.test.ts b/src/test/moves/toxic_spikes.test.ts
new file mode 100644
index 00000000000..bac1ccdccd8
--- /dev/null
+++ b/src/test/moves/toxic_spikes.test.ts
@@ -0,0 +1,136 @@
+import { ArenaTagSide, ArenaTrapTag } from "#app/data/arena-tag";
+import { StatusEffect } from "#app/data/status-effect";
+import { decrypt, encrypt, GameData, SessionSaveData } from "#app/system/game-data";
+import { Abilities } from "#enums/abilities";
+import { ArenaTagType } from "#enums/arena-tag-type";
+import { Moves } from "#enums/moves";
+import { Species } from "#enums/species";
+import GameManager from "#test/utils/gameManager";
+import Phaser from "phaser";
+import { afterEach, beforeAll, beforeEach, describe, expect, it } from "vitest";
+
+const TIMEOUT = 20 * 1000;
+
+describe("Moves - Toxic Spikes", () => {
+  let phaserGame: Phaser.Game;
+  let game: GameManager;
+
+  beforeAll(() => {
+    phaserGame = new Phaser.Game({
+      type: Phaser.HEADLESS,
+    });
+  });
+
+  afterEach(() => {
+    game.phaseInterceptor.restoreOg();
+  });
+
+  beforeEach(() => {
+    game = new GameManager(phaserGame);
+    game.override
+      .battleType("single")
+      .startingWave(5)
+      .enemySpecies(Species.RATTATA)
+      .enemyAbility(Abilities.BALL_FETCH)
+      .ability(Abilities.BALL_FETCH)
+      .enemyMoveset(Moves.SPLASH)
+      .moveset([ Moves.TOXIC_SPIKES, Moves.SPLASH, Moves.ROAR ]);
+  });
+
+  it("should not affect the opponent if they do not switch", async() => {
+    await game.classicMode.runToSummon([ Species.MIGHTYENA, Species.POOCHYENA ]);
+
+    const enemy = game.scene.getEnemyField()[0];
+
+    game.move.select(Moves.TOXIC_SPIKES);
+    await game.phaseInterceptor.to("TurnEndPhase");
+    game.move.select(Moves.SPLASH);
+    await game.phaseInterceptor.to("TurnEndPhase");
+    game.doSwitchPokemon(1);
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    expect(enemy.hp).toBe(enemy.getMaxHp());
+    expect(enemy.status?.effect).toBeUndefined();
+  }, TIMEOUT);
+
+  it("should poison the opponent if they switch into 1 layer", async() => {
+    await game.classicMode.runToSummon([ Species.MIGHTYENA ]);
+
+    game.move.select(Moves.TOXIC_SPIKES);
+    await game.phaseInterceptor.to("TurnEndPhase");
+    game.move.select(Moves.ROAR);
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    const enemy = game.scene.getEnemyField()[0];
+
+    expect(enemy.hp).toBeLessThan(enemy.getMaxHp());
+    expect(enemy.status?.effect).toBe(StatusEffect.POISON);
+  }, TIMEOUT);
+
+  it("should badly poison the opponent if they switch into 2 layers", async() => {
+    await game.classicMode.runToSummon([ Species.MIGHTYENA ]);
+
+    game.move.select(Moves.TOXIC_SPIKES);
+    await game.phaseInterceptor.to("TurnEndPhase");
+    game.move.select(Moves.TOXIC_SPIKES);
+    await game.phaseInterceptor.to("TurnEndPhase");
+    game.move.select(Moves.ROAR);
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    const enemy = game.scene.getEnemyField()[0];
+    expect(enemy.hp).toBeLessThan(enemy.getMaxHp());
+    expect(enemy.status?.effect).toBe(StatusEffect.TOXIC);
+  }, TIMEOUT);
+
+  it("should be removed if a grounded poison pokemon switches in", async() => {
+    game.override.enemySpecies(Species.GRIMER);
+    await game.classicMode.runToSummon([ Species.MIGHTYENA ]);
+
+    game.move.select(Moves.TOXIC_SPIKES);
+    await game.phaseInterceptor.to("TurnEndPhase");
+    game.move.select(Moves.TOXIC_SPIKES);
+    await game.phaseInterceptor.to("TurnEndPhase");
+    game.move.select(Moves.ROAR);
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    const enemy = game.scene.getEnemyField()[0];
+    expect(enemy.hp).toBe(enemy.getMaxHp());
+    expect(enemy.status?.effect).toBeUndefined();
+
+    expect(game.scene.arena.tags.length).toBe(0);
+  }, TIMEOUT);
+
+  it("shouldn't create multiple layers per use in doubles", async() => {
+    await game.classicMode.runToSummon([ Species.MIGHTYENA, Species.POOCHYENA ]);
+
+    game.move.select(Moves.TOXIC_SPIKES);
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    const arenaTags = (game.scene.arena.getTagOnSide(ArenaTagType.TOXIC_SPIKES, ArenaTagSide.ENEMY) as ArenaTrapTag);
+    expect(arenaTags.tagType).toBe(ArenaTagType.TOXIC_SPIKES);
+    expect(arenaTags.layers).toBe(1);
+  }, TIMEOUT);
+
+  it("should persist through reload", async() => {
+    game.override.startingWave(1);
+    const scene = game.scene;
+    const gameData = new GameData(scene);
+
+    await game.classicMode.runToSummon([ Species.MIGHTYENA ]);
+
+    game.move.select(Moves.TOXIC_SPIKES);
+    await game.phaseInterceptor.to("TurnEndPhase");
+    game.move.select(Moves.SPLASH);
+    await game.doKillOpponents();
+    await game.phaseInterceptor.to("BattleEndPhase");
+    await game.toNextWave();
+
+    const sessionData : SessionSaveData = gameData["getSessionSaveData"](game.scene);
+    localStorage.setItem("sessionTestData", encrypt(JSON.stringify(sessionData), true));
+    const recoveredData : SessionSaveData = gameData.parseSessionData(decrypt(localStorage.getItem("sessionTestData")!, true));
+    gameData.loadSession(game.scene, 0, recoveredData);
+
+    expect(sessionData.arena.tags).toEqual(recoveredData.arena.tags);
+    localStorage.removeItem("sessionTestData");
+  }, TIMEOUT);
+});