Some ActiveEffect shenanigans with training levels

module/documents/Actor/Player.mjs

@@ -1,8 +1,17 @@
 import { DotDungeonActor } from "./GenericActor.mjs";
-import { DotDungeonItem } from "../Item/GenericItem.mjs";
 
 export class Player extends DotDungeonActor {
 
+	applyActiveEffects() {
+		super.applyActiveEffects();
+
+		// These are the (groups of) fields that ActiveEffects may modify safely
+		// and remain editable in the sheet. This needs to be done because of default
+		// Foundry behaviour that otherwise prevents these fields from being edited
+		delete this.overrides.system.stats;
+		delete this.overrides.system.skills;
+	};
+
 	async createCustomPet() {
 		const body = new URLSearchParams({
 			number: 1,

module/sheets/Actors/PC/PlayerSheetV2.mjs

@@ -74,6 +74,7 @@ export class PlayerSheetv2 extends GenericActorSheet {
 		/** @type {ActorHandler} */
 		const actor = this.actor;
 
+		ctx.original = actor.toObject().system;
 		ctx.system = actor.system;
 		ctx.flags = actor.flags;
 		ctx.items = this.actor.itemTypes;
@@ -92,11 +93,13 @@ export class PlayerSheetv2 extends GenericActorSheet {
 
 	get #statData() {
 		const stats = [];
-		const usedDice = new Set(Object.values(this.actor.system.stats));
-		for (const statName in this.actor.system.stats) {
+		const original = this.actor.toObject().system;
+		const usedDice = new Set(Object.values(original.stats));
+		for (const statName in original.stats) {
 			const stat = {
 				key: statName,
 				name: localizer(`dotdungeon.stat.${statName}`),
+				original: original.stats[statName],
 				value: this.actor.system.stats[statName],
 			};
 
@@ -111,7 +114,7 @@ export class PlayerSheetv2 extends GenericActorSheet {
 					return {
 						value: die,
 						label: localizer(`dotdungeon.die.${die}`, { stat: statName }),
-						disabled: usedDice.has(die) && this.actor.system.stats[statName] !== die,
+						disabled: usedDice.has(die) && original.stats[statName] !== die,
 					};
 				})
 			];
@@ -127,6 +130,7 @@ export class PlayerSheetv2 extends GenericActorSheet {
 					key: skill,
 					name: game.i18n.format(`dotdungeon.skills.${skill}`),
 					value,
+					original: original.skills[statName][skill],
 					formula: `1` + stat.value + modifierToString(value, { spaces: true }),
 					rollDisabled: value === -1,
 				});

templates/actors/char-sheet/v2/partials/stats.v2.pc.hbs

@@ -7,7 +7,7 @@
 					name="system.stats.{{stat.key}}"
 					class="e-2dp dice-select"
 				>
-					{{{dd-options stat.value stat.dieOptions}}}
+					{{{dd-options stat.original stat.dieOptions}}}
 				</select>
 				<button
 					type="button"
@@ -35,7 +35,7 @@
 								class="e-2dp skill__training"
 							>
 								{{{dd-options
-									skill.value
+									skill.original
 									@root.config.trainingLevels
 									localize=true
 								}}}