Add Pathfinder 2e game system mode

Implements PF2e as an alternative game system alongside D&D 5e/5.5e.
Settings modal "Game System" selector switches conditions, bestiary,
stat block layout, and initiative calculation between systems.

- Valued conditions with increment/decrement UX (Clumsy 2, Frightened 3)
- 2,502 PF2e creatures from bundled search index (77 sources)
- PF2e stat block: level, traits, Perception, Fort/Ref/Will, ability mods
- Perception-based initiative rolling
- System-scoped source cache (D&D and PF2e sources don't collide)
- Backwards-compatible condition rehydration (ConditionId[] → ConditionEntry[])
- Difficulty indicator hidden in PF2e mode (excluded from MVP)

Closes dostulata/initiative#19

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/domain/src/__tests__/clear-encounter.test.ts

@@ -54,7 +54,7 @@ describe("clearEncounter", () => {
 					maxHp: 50,
 					currentHp: 30,
 					ac: 18,
-					conditions: ["blinded", "poisoned"],
+					conditions: [{ id: "blinded" }, { id: "poisoned" }],
 					isConcentrating: true,
 				},
 				{
@@ -63,7 +63,7 @@ describe("clearEncounter", () => {
 					maxHp: 25,
 					currentHp: 0,
 					ac: 12,
-					conditions: ["unconscious"],
+					conditions: [{ id: "unconscious" }],
 				},
 			],
 			activeIndex: 0,

packages/domain/src/__tests__/conditions.test.ts

@@ -26,25 +26,40 @@ describe("getConditionDescription", () => {
 		);
 	});
 
-	it("universal conditions have both descriptions", () => {
-		const universal = CONDITION_DEFINITIONS.filter(
-			(d) => d.edition === undefined,
+	it("returns pf2e description when edition is pf2e", () => {
+		const blinded = findCondition("blinded");
+		expect(getConditionDescription(blinded, "pf2e")).toBe(
+			blinded.descriptionPf2e,
 		);
-		expect(universal.length).toBeGreaterThan(0);
-		for (const def of universal) {
-			expect(def.description).toBeTruthy();
-			expect(def.description5e).toBeTruthy();
+	});
+
+	it("falls back to default description for pf2e when no pf2e text", () => {
+		const paralyzed = findCondition("paralyzed");
+		expect(getConditionDescription(paralyzed, "pf2e")).toBe(
+			paralyzed.descriptionPf2e,
+		);
+	});
+
+	it("shared D&D conditions have both description and description5e", () => {
+		const sharedDndConditions = CONDITION_DEFINITIONS.filter(
+			(d) =>
+				d.systems === undefined ||
+				(d.systems.includes("5e") && d.systems.includes("5.5e")),
+		);
+		for (const def of sharedDndConditions) {
+			expect(def.description, `${def.id} missing description`).toBeTruthy();
+			expect(def.description5e, `${def.id} missing description5e`).toBeTruthy();
 		}
 	});
 
-	it("edition-specific conditions have their edition description", () => {
+	it("system-specific conditions use the systems field", () => {
 		const sapped = findCondition("sapped");
 		expect(sapped.description).toBeTruthy();
-		expect(sapped.edition).toBe("5.5e");
+		expect(sapped.systems).toContain("5.5e");
 
 		const slowed = findCondition("slowed");
 		expect(slowed.description).toBeTruthy();
-		expect(slowed.edition).toBe("5.5e");
+		expect(slowed.systems).toContain("5.5e");
 	});
 
 	it("conditions with identical rules share the same text", () => {
@@ -79,4 +94,34 @@ describe("getConditionsForEdition", () => {
 		expect(ids5e).toContain("blinded");
 		expect(ids55e).toContain("blinded");
 	});
+
+	it("returns PF2e conditions for pf2e edition", () => {
+		const conditions = getConditionsForEdition("pf2e");
+		const ids = conditions.map((d) => d.id);
+		expect(ids).toContain("clumsy");
+		expect(ids).toContain("drained");
+		expect(ids).toContain("off-guard");
+		expect(ids).toContain("sickened");
+		expect(ids).not.toContain("charmed");
+		expect(ids).not.toContain("exhaustion");
+		expect(ids).not.toContain("grappled");
+	});
+
+	it("returns D&D conditions for 5.5e", () => {
+		const conditions = getConditionsForEdition("5.5e");
+		const ids = conditions.map((d) => d.id);
+		expect(ids).toContain("charmed");
+		expect(ids).toContain("exhaustion");
+		expect(ids).not.toContain("clumsy");
+		expect(ids).not.toContain("off-guard");
+	});
+
+	it("shared conditions appear in both D&D and PF2e", () => {
+		const dndIds = getConditionsForEdition("5.5e").map((d) => d.id);
+		const pf2eIds = getConditionsForEdition("pf2e").map((d) => d.id);
+		expect(dndIds).toContain("blinded");
+		expect(pf2eIds).toContain("blinded");
+		expect(dndIds).toContain("prone");
+		expect(pf2eIds).toContain("prone");
+	});
 });

packages/domain/src/__tests__/initiative.test.ts

@@ -1,6 +1,7 @@
 import { describe, expect, it } from "vitest";
 import {
 	calculateInitiative,
+	calculatePf2eInitiative,
 	formatInitiativeModifier,
 } from "../initiative.js";
 
@@ -93,6 +94,26 @@ describe("calculateInitiative", () => {
 	});
 });
 
+describe("calculatePf2eInitiative", () => {
+	it("returns perception as both modifier and passive", () => {
+		const result = calculatePf2eInitiative(11);
+		expect(result.modifier).toBe(11);
+		expect(result.passive).toBe(11);
+	});
+
+	it("handles zero perception", () => {
+		const result = calculatePf2eInitiative(0);
+		expect(result.modifier).toBe(0);
+		expect(result.passive).toBe(0);
+	});
+
+	it("handles negative perception", () => {
+		const result = calculatePf2eInitiative(-2);
+		expect(result.modifier).toBe(-2);
+		expect(result.passive).toBe(-2);
+	});
+});
+
 describe("formatInitiativeModifier", () => {
 	it("formats positive modifier with plus sign", () => {
 		expect(formatInitiativeModifier(7)).toBe("+7");

packages/domain/src/__tests__/rehydrate-combatant.test.ts

@@ -35,7 +35,7 @@ describe("rehydrateCombatant", () => {
 			expect(result?.maxHp).toBe(7);
 			expect(result?.currentHp).toBe(5);
 			expect(result?.tempHp).toBe(3);
-			expect(result?.conditions).toEqual(["poisoned"]);
+			expect(result?.conditions).toEqual([{ id: "poisoned" }]);
 			expect(result?.isConcentrating).toBe(true);
 			expect(result?.creatureId).toBe("creature-goblin");
 			expect(result?.color).toBe("red");
@@ -165,7 +165,45 @@ describe("rehydrateCombatant", () => {
 				...minimalCombatant(),
 				conditions: ["poisoned", "fake", "blinded"],
 			});
-			expect(result?.conditions).toEqual(["poisoned", "blinded"]);
+			expect(result?.conditions).toEqual([
+				{ id: "poisoned" },
+				{ id: "blinded" },
+			]);
+		});
+
+		it("converts old bare string format to ConditionEntry", () => {
+			const result = rehydrateCombatant({
+				...minimalCombatant(),
+				conditions: ["blinded", "prone"],
+			});
+			expect(result?.conditions).toEqual([{ id: "blinded" }, { id: "prone" }]);
+		});
+
+		it("passes through new ConditionEntry format with values", () => {
+			const result = rehydrateCombatant({
+				...minimalCombatant(),
+				conditions: [{ id: "blinded" }, { id: "frightened", value: 2 }],
+			});
+			expect(result?.conditions).toEqual([
+				{ id: "blinded" },
+				{ id: "frightened", value: 2 },
+			]);
+		});
+
+		it("handles mixed old and new format entries", () => {
+			const result = rehydrateCombatant({
+				...minimalCombatant(),
+				conditions: ["blinded", { id: "prone" }],
+			});
+			expect(result?.conditions).toEqual([{ id: "blinded" }, { id: "prone" }]);
+		});
+
+		it("drops ConditionEntry with invalid value", () => {
+			const result = rehydrateCombatant({
+				...minimalCombatant(),
+				conditions: [{ id: "blinded", value: -1 }],
+			});
+			expect(result?.conditions).toEqual([{ id: "blinded" }]);
 		});
 
 		it("drops invalid color — keeps combatant", () => {

packages/domain/src/__tests__/toggle-condition.test.ts

@@ -1,14 +1,18 @@
 import { describe, expect, it } from "vitest";
-import type { ConditionId } from "../conditions.js";
+import type { ConditionEntry, ConditionId } from "../conditions.js";
 import { CONDITION_DEFINITIONS } from "../conditions.js";
-import { toggleCondition } from "../toggle-condition.js";
+import {
+	decrementCondition,
+	setConditionValue,
+	toggleCondition,
+} from "../toggle-condition.js";
 import type { Combatant, Encounter } from "../types.js";
 import { combatantId, isDomainError } from "../types.js";
 import { expectDomainError } from "./test-helpers.js";
 
 function makeCombatant(
 	name: string,
-	conditions?: readonly ConditionId[],
+	conditions?: readonly ConditionEntry[],
 ): Combatant {
 	return conditions
 		? { id: combatantId(name), name, conditions }
@@ -32,7 +36,7 @@ describe("toggleCondition", () => {
 		const e = enc([makeCombatant("A")]);
 		const { encounter, events } = success(e, "A", "blinded");
 
-		expect(encounter.combatants[0].conditions).toEqual(["blinded"]);
+		expect(encounter.combatants[0].conditions).toEqual([{ id: "blinded" }]);
 		expect(events).toEqual([
 			{
 				type: "ConditionAdded",
@@ -43,7 +47,7 @@ describe("toggleCondition", () => {
 	});
 
 	it("removes a condition when already present", () => {
-		const e = enc([makeCombatant("A", ["blinded"])]);
+		const e = enc([makeCombatant("A", [{ id: "blinded" }])]);
 		const { encounter, events } = success(e, "A", "blinded");
 
 		expect(encounter.combatants[0].conditions).toBeUndefined();
@@ -57,14 +61,17 @@ describe("toggleCondition", () => {
 	});
 
 	it("maintains definition order when adding conditions", () => {
-		const e = enc([makeCombatant("A", ["poisoned"])]);
+		const e = enc([makeCombatant("A", [{ id: "poisoned" }])]);
 		const { encounter } = success(e, "A", "blinded");
 
-		expect(encounter.combatants[0].conditions).toEqual(["blinded", "poisoned"]);
+		expect(encounter.combatants[0].conditions).toEqual([
+			{ id: "blinded" },
+			{ id: "poisoned" },
+		]);
 	});
 
 	it("prevents duplicate conditions", () => {
-		const e = enc([makeCombatant("A", ["blinded"])]);
+		const e = enc([makeCombatant("A", [{ id: "blinded" }])]);
 		// Toggling blinded again removes it, not duplicates
 		const { encounter } = success(e, "A", "blinded");
 		expect(encounter.combatants[0].conditions).toBeUndefined();
@@ -96,7 +103,7 @@ describe("toggleCondition", () => {
 	});
 
 	it("normalizes empty array to undefined on removal", () => {
-		const e = enc([makeCombatant("A", ["charmed"])]);
+		const e = enc([makeCombatant("A", [{ id: "charmed" }])]);
 		const { encounter } = success(e, "A", "charmed");
 
 		expect(encounter.combatants[0].conditions).toBeUndefined();
@@ -110,6 +117,91 @@ describe("toggleCondition", () => {
 			const result = success(e, "A", cond);
 			e = result.encounter;
 		}
-		expect(e.combatants[0].conditions).toEqual(order);
+		expect(e.combatants[0].conditions).toEqual(order.map((id) => ({ id })));
+	});
+});
+
+describe("setConditionValue", () => {
+	it("adds a valued condition at the specified value", () => {
+		const e = enc([makeCombatant("A")]);
+		const result = setConditionValue(e, combatantId("A"), "frightened", 2);
+		if (isDomainError(result)) throw new Error(result.message);
+
+		expect(result.encounter.combatants[0].conditions).toEqual([
+			{ id: "frightened", value: 2 },
+		]);
+		expect(result.events).toEqual([
+			{
+				type: "ConditionAdded",
+				combatantId: combatantId("A"),
+				condition: "frightened",
+				value: 2,
+			},
+		]);
+	});
+
+	it("updates the value of an existing condition", () => {
+		const e = enc([makeCombatant("A", [{ id: "frightened", value: 1 }])]);
+		const result = setConditionValue(e, combatantId("A"), "frightened", 3);
+		if (isDomainError(result)) throw new Error(result.message);
+
+		expect(result.encounter.combatants[0].conditions).toEqual([
+			{ id: "frightened", value: 3 },
+		]);
+	});
+
+	it("removes condition when value is 0", () => {
+		const e = enc([makeCombatant("A", [{ id: "frightened", value: 2 }])]);
+		const result = setConditionValue(e, combatantId("A"), "frightened", 0);
+		if (isDomainError(result)) throw new Error(result.message);
+
+		expect(result.encounter.combatants[0].conditions).toBeUndefined();
+		expect(result.events[0].type).toBe("ConditionRemoved");
+	});
+
+	it("rejects unknown condition", () => {
+		const e = enc([makeCombatant("A")]);
+		const result = setConditionValue(
+			e,
+			combatantId("A"),
+			"flying" as ConditionId,
+			1,
+		);
+		expectDomainError(result, "unknown-condition");
+	});
+});
+
+describe("decrementCondition", () => {
+	it("decrements value by 1", () => {
+		const e = enc([makeCombatant("A", [{ id: "frightened", value: 3 }])]);
+		const result = decrementCondition(e, combatantId("A"), "frightened");
+		if (isDomainError(result)) throw new Error(result.message);
+
+		expect(result.encounter.combatants[0].conditions).toEqual([
+			{ id: "frightened", value: 2 },
+		]);
+	});
+
+	it("removes condition when value reaches 0", () => {
+		const e = enc([makeCombatant("A", [{ id: "frightened", value: 1 }])]);
+		const result = decrementCondition(e, combatantId("A"), "frightened");
+		if (isDomainError(result)) throw new Error(result.message);
+
+		expect(result.encounter.combatants[0].conditions).toBeUndefined();
+		expect(result.events[0].type).toBe("ConditionRemoved");
+	});
+
+	it("removes non-valued condition (value undefined treated as 1)", () => {
+		const e = enc([makeCombatant("A", [{ id: "blinded" }])]);
+		const result = decrementCondition(e, combatantId("A"), "blinded");
+		if (isDomainError(result)) throw new Error(result.message);
+
+		expect(result.encounter.combatants[0].conditions).toBeUndefined();
+	});
+
+	it("returns error for inactive condition", () => {
+		const e = enc([makeCombatant("A")]);
+		const result = decrementCondition(e, combatantId("A"), "frightened");
+		expectDomainError(result, "condition-not-active");
 	});
 });

packages/domain/src/conditions.ts

@@ -1,21 +1,48 @@
 export type ConditionId =
 	| "blinded"
 	| "charmed"
+	| "clumsy"
+	| "concealed"
+	| "confused"
+	| "controlled"
+	| "dazzled"
 	| "deafened"
+	| "doomed"
+	| "drained"
+	| "dying"
+	| "enfeebled"
 	| "exhaustion"
+	| "fascinated"
+	| "fatigued"
+	| "fleeing"
 	| "frightened"
+	| "grabbed"
 	| "grappled"
+	| "hidden"
+	| "immobilized"
 	| "incapacitated"
 	| "invisible"
+	| "off-guard"
 	| "paralyzed"
 	| "petrified"
 	| "poisoned"
 	| "prone"
+	| "quickened"
 	| "restrained"
 	| "sapped"
+	| "sickened"
 	| "slowed"
+	| "slowed-pf2e"
 	| "stunned"
-	| "unconscious";
+	| "stupefied"
+	| "unconscious"
+	| "undetected"
+	| "wounded";
+
+export interface ConditionEntry {
+	readonly id: ConditionId;
+	readonly value?: number;
+}
 
 import type { RulesEdition } from "./rules-edition.js";
 
@@ -24,20 +51,24 @@ export interface ConditionDefinition {
 	readonly label: string;
 	readonly description: string;
 	readonly description5e: string;
+	readonly descriptionPf2e?: string;
 	readonly iconName: string;
 	readonly color: string;
-	/** When set, the condition only appears in this edition's picker. */
-	readonly edition?: RulesEdition;
+	/** When set, the condition only appears in these systems' pickers. */
+	readonly systems?: readonly RulesEdition[];
+	readonly valued?: boolean;
 }
 
 export function getConditionDescription(
 	def: ConditionDefinition,
 	edition: RulesEdition,
 ): string {
+	if (edition === "pf2e" && def.descriptionPf2e) return def.descriptionPf2e;
 	return edition === "5e" ? def.description5e : def.description;
 }
 
 export const CONDITION_DEFINITIONS: readonly ConditionDefinition[] = [
+	// ── Shared conditions (D&D + PF2e) ──
 	{
 		id: "blinded",
 		label: "Blinded",
@@ -45,6 +76,8 @@ export const CONDITION_DEFINITIONS: readonly ConditionDefinition[] = [
 			"Can't see. Auto-fail sight checks. Attacks have Disadvantage; attacks against have Advantage.",
 		description5e:
 			"Can't see. Auto-fail sight checks. Attacks have Disadvantage; attacks against have Advantage.",
+		descriptionPf2e:
+			"Can't see. All terrain is difficult terrain. –4 status penalty to Perception checks involving sight. Immune to visual effects. Auto-fail checks requiring sight. Off-guard.",
 		iconName: "EyeOff",
 		color: "neutral",
 	},
@@ -57,12 +90,15 @@ export const CONDITION_DEFINITIONS: readonly ConditionDefinition[] = [
 			"Can't attack or target the charmer with harmful abilities. Charmer has Advantage on social checks.",
 		iconName: "Heart",
 		color: "pink",
+		systems: ["5e", "5.5e"],
 	},
 	{
 		id: "deafened",
 		label: "Deafened",
 		description: "Can't hear. Auto-fail hearing checks.",
 		description5e: "Can't hear. Auto-fail hearing checks.",
+		descriptionPf2e:
+			"Can't hear. –2 status penalty to Perception checks and Initiative. Auto-fail hearing checks. Immune to auditory effects.",
 		iconName: "EarOff",
 		color: "neutral",
 	},
@@ -75,6 +111,7 @@ export const CONDITION_DEFINITIONS: readonly ConditionDefinition[] = [
 			"L1: Disadvantage on ability checks\nL2: Speed halved\nL3: Disadvantage on attacks and saves\nL4: HP max halved\nL5: Speed 0\nL6: Death\nLong rest removes 1 level.",
 		iconName: "BatteryLow",
 		color: "amber",
+		systems: ["5e", "5.5e"],
 	},
 	{
 		id: "frightened",
@@ -83,8 +120,11 @@ export const CONDITION_DEFINITIONS: readonly ConditionDefinition[] = [
 			"Disadvantage on ability checks and attacks while source of fear is in line of sight. Can't willingly move closer to the source.",
 		description5e:
 			"Disadvantage on ability checks and attacks while source of fear is in line of sight. Can't willingly move closer to the source.",
+		descriptionPf2e:
+			"–X status penalty to all checks and DCs (X = value). Can't willingly approach the source.",
 		iconName: "Siren",
 		color: "orange",
+		valued: true,
 	},
 	{
 		id: "grappled",
@@ -95,6 +135,7 @@ export const CONDITION_DEFINITIONS: readonly ConditionDefinition[] = [
 			"Speed 0. Ends if grappler is Incapacitated or moved out of reach.",
 		iconName: "Hand",
 		color: "neutral",
+		systems: ["5e", "5.5e"],
 	},
 	{
 		id: "incapacitated",
@@ -104,6 +145,7 @@ export const CONDITION_DEFINITIONS: readonly ConditionDefinition[] = [
 		description5e: "Can't take Actions or Reactions.",
 		iconName: "Ban",
 		color: "gray",
+		systems: ["5e", "5.5e"],
 	},
 	{
 		id: "invisible",
@@ -112,6 +154,8 @@ export const CONDITION_DEFINITIONS: readonly ConditionDefinition[] = [
 			"Can't be seen. Advantage on Initiative. Not affected by effects requiring sight (unless caster sees you). Attacks have Advantage; attacks against have Disadvantage.",
 		description5e:
 			"Impossible to see without magic or special sense. Heavily Obscured. Attacks have Advantage; attacks against have Disadvantage.",
+		descriptionPf2e:
+			"Can't be seen except by special senses. Undetected to everyone. Can't be targeted except by effects that don't require sight.",
 		iconName: "Ghost",
 		color: "violet",
 	},
@@ -122,6 +166,7 @@ export const CONDITION_DEFINITIONS: readonly ConditionDefinition[] = [
 			"Incapacitated. Can't move or speak. Auto-fail Str/Dex saves. Attacks against have Advantage. Hits within 5 ft. are critical.",
 		description5e:
 			"Incapacitated. Can't move or speak. Auto-fail Str/Dex saves. Attacks against have Advantage. Hits within 5 ft. are critical.",
+		descriptionPf2e: "Can't act. Off-guard. –4 status penalty to AC.",
 		iconName: "ZapOff",
 		color: "yellow",
 	},
@@ -132,6 +177,8 @@ export const CONDITION_DEFINITIONS: readonly ConditionDefinition[] = [
 			"Turned to stone. Weight \u00D710. Incapacitated. Can't move or speak. Attacks against have Advantage. Auto-fail Str/Dex saves. Resistant to all damage. Immune to poison and disease.",
 		description5e:
 			"Turned to stone. Weight \u00D710. Incapacitated. Can't move or speak. Attacks against have Advantage. Auto-fail Str/Dex saves. Resistant to all damage. Immune to poison and disease.",
+		descriptionPf2e:
+			"Can't act. Can't sense anything. AC = 9. Hardness 8. Immune to most effects.",
 		iconName: "Gem",
 		color: "slate",
 	},
@@ -142,6 +189,7 @@ export const CONDITION_DEFINITIONS: readonly ConditionDefinition[] = [
 		description5e: "Disadvantage on attack rolls and ability checks.",
 		iconName: "Droplet",
 		color: "green",
+		systems: ["5e", "5.5e"],
 	},
 	{
 		id: "prone",
@@ -150,6 +198,8 @@ export const CONDITION_DEFINITIONS: readonly ConditionDefinition[] = [
 			"Can only crawl (costs extra movement). Disadvantage on attacks. Attacks within 5 ft. have Advantage; ranged attacks have Disadvantage. Standing up costs half movement.",
 		description5e:
 			"Can only crawl (costs extra movement). Disadvantage on attacks. Attacks within 5 ft. have Advantage; ranged attacks have Disadvantage. Standing up costs half movement.",
+		descriptionPf2e:
+			"Off-guard. –2 circumstance penalty to attack rolls. Only movement is Crawl and Stand. +1 circumstance bonus to AC vs. ranged attacks, –2 vs. melee.",
 		iconName: "ArrowDown",
 		color: "neutral",
 	},
@@ -160,6 +210,8 @@ export const CONDITION_DEFINITIONS: readonly ConditionDefinition[] = [
 			"Speed is 0. Attacks have Disadvantage. Attacks against have Advantage. Disadvantage on Dex saves.",
 		description5e:
 			"Speed is 0. Attacks have Disadvantage. Attacks against have Advantage. Disadvantage on Dex saves.",
+		descriptionPf2e:
+			"Off-guard. Immobilized. Can't use any actions with the attack trait except to attempt to Escape.",
 		iconName: "Link",
 		color: "neutral",
 	},
@@ -171,7 +223,7 @@ export const CONDITION_DEFINITIONS: readonly ConditionDefinition[] = [
 		description5e: "",
 		iconName: "ShieldMinus",
 		color: "amber",
-		edition: "5.5e",
+		systems: ["5.5e"],
 	},
 	{
 		id: "slowed",
@@ -181,7 +233,7 @@ export const CONDITION_DEFINITIONS: readonly ConditionDefinition[] = [
 		description5e: "",
 		iconName: "Snail",
 		color: "sky",
-		edition: "5.5e",
+		systems: ["5.5e"],
 	},
 	{
 		id: "stunned",
@@ -190,8 +242,11 @@ export const CONDITION_DEFINITIONS: readonly ConditionDefinition[] = [
 			"Incapacitated (can't act or speak). Auto-fail Str/Dex saves. Attacks against have Advantage.",
 		description5e:
 			"Incapacitated. Can't move. Can speak only falteringly. Auto-fail Str/Dex saves. Attacks against have Advantage.",
+		descriptionPf2e:
+			"Can't act. –X value to actions per turn while the value counts down.",
 		iconName: "Sparkles",
 		color: "yellow",
+		valued: true,
 	},
 	{
 		id: "unconscious",
@@ -200,9 +255,261 @@ export const CONDITION_DEFINITIONS: readonly ConditionDefinition[] = [
 			"Incapacitated. Speed 0. Can't move or speak. Unaware of surroundings. Drops held items, falls Prone. Auto-fail Str/Dex saves. Attacks against have Advantage. Hits within 5 ft. are critical.",
 		description5e:
 			"Incapacitated. Speed 0. Can't move or speak. Unaware of surroundings. Drops held items, falls Prone. Auto-fail Str/Dex saves. Attacks against have Advantage. Hits within 5 ft. are critical.",
+		descriptionPf2e:
+			"Can't act. Off-guard. –4 status penalty to AC. –3 to Perception. Fall prone, drop items.",
 		iconName: "Moon",
 		color: "indigo",
 	},
+	// ── PF2e-only conditions ──
+	{
+		id: "clumsy",
+		label: "Clumsy",
+		description: "",
+		description5e: "",
+		descriptionPf2e:
+			"–X status penalty to Dex-based checks and DCs, including AC, Reflex saves, and ranged attack rolls.",
+		iconName: "Footprints",
+		color: "amber",
+		systems: ["pf2e"],
+		valued: true,
+	},
+	{
+		id: "concealed",
+		label: "Concealed",
+		description: "",
+		description5e: "",
+		descriptionPf2e:
+			"DC 5 flat check for targeted attacks. Doesn't change which creatures can see you.",
+		iconName: "CloudFog",
+		color: "slate",
+		systems: ["pf2e"],
+	},
+	{
+		id: "confused",
+		label: "Confused",
+		description: "",
+		description5e: "",
+		descriptionPf2e:
+			"Off-guard. Can't Delay, Ready, or use reactions. GM determines targets randomly. Flat check DC 11 to act normally each turn.",
+		iconName: "CircleHelp",
+		color: "pink",
+		systems: ["pf2e"],
+	},
+	{
+		id: "controlled",
+		label: "Controlled",
+		description: "",
+		description5e: "",
+		descriptionPf2e:
+			"Another creature determines your actions. You gain no actions of your own.",
+		iconName: "Drama",
+		color: "pink",
+		systems: ["pf2e"],
+	},
+	{
+		id: "dazzled",
+		label: "Dazzled",
+		description: "",
+		description5e: "",
+		descriptionPf2e:
+			"All creatures and objects are concealed to you. DC 5 flat check for targeted attacks requiring sight.",
+		iconName: "Sun",
+		color: "yellow",
+		systems: ["pf2e"],
+	},
+	{
+		id: "doomed",
+		label: "Doomed",
+		description: "",
+		description5e: "",
+		descriptionPf2e:
+			"Die at dying X (where X = 4 – doomed value instead of dying 4). Decreases by 1 on full night's rest.",
+		iconName: "Skull",
+		color: "red",
+		systems: ["pf2e"],
+		valued: true,
+	},
+	{
+		id: "drained",
+		label: "Drained",
+		description: "",
+		description5e: "",
+		descriptionPf2e:
+			"–X status penalty to Con-based checks and DCs. Lose X × Hit Die in max HP. Decreases by 1 on full night's rest.",
+		iconName: "Droplets",
+		color: "red",
+		systems: ["pf2e"],
+		valued: true,
+	},
+	{
+		id: "dying",
+		label: "Dying",
+		description: "",
+		description5e: "",
+		descriptionPf2e:
+			"Unconscious. Make recovery checks at start of turn. At dying 4 (or 4 – doomed), you die.",
+		iconName: "HeartPulse",
+		color: "red",
+		systems: ["pf2e"],
+		valued: true,
+	},
+	{
+		id: "enfeebled",
+		label: "Enfeebled",
+		description: "",
+		description5e: "",
+		descriptionPf2e:
+			"–X status penalty to Str-based rolls, including melee attack and damage rolls.",
+		iconName: "TrendingDown",
+		color: "amber",
+		systems: ["pf2e"],
+		valued: true,
+	},
+	{
+		id: "fascinated",
+		label: "Fascinated",
+		description: "",
+		description5e: "",
+		descriptionPf2e:
+			"–2 status penalty to all checks. Can't use hostile actions. Ends if hostile action is used against you.",
+		iconName: "Eye",
+		color: "violet",
+		systems: ["pf2e"],
+	},
+	{
+		id: "fatigued",
+		label: "Fatigued",
+		description: "",
+		description5e: "",
+		descriptionPf2e:
+			"–1 status penalty to AC and saves. Can't use exploration activities while traveling. Recover after a full night's rest.",
+		iconName: "BatteryLow",
+		color: "amber",
+		systems: ["pf2e"],
+	},
+	{
+		id: "fleeing",
+		label: "Fleeing",
+		description: "",
+		description5e: "",
+		descriptionPf2e:
+			"Must spend actions to move away from the source. Can't Delay or Ready.",
+		iconName: "PersonStanding",
+		color: "orange",
+		systems: ["pf2e"],
+	},
+	{
+		id: "grabbed",
+		label: "Grabbed",
+		description: "",
+		description5e: "",
+		descriptionPf2e:
+			"Immobilized. Off-guard. Can't use actions with the move trait unless to Break Grapple.",
+		iconName: "Hand",
+		color: "neutral",
+		systems: ["pf2e"],
+	},
+	{
+		id: "hidden",
+		label: "Hidden",
+		description: "",
+		description5e: "",
+		descriptionPf2e:
+			"Known location but can't be seen. DC 11 flat check to target. Can use Seek to find.",
+		iconName: "EyeOff",
+		color: "slate",
+		systems: ["pf2e"],
+	},
+	{
+		id: "immobilized",
+		label: "Immobilized",
+		description: "",
+		description5e: "",
+		descriptionPf2e:
+			"Can't use any action with the move trait to change position.",
+		iconName: "Anchor",
+		color: "neutral",
+		systems: ["pf2e"],
+	},
+	{
+		id: "off-guard",
+		label: "Off-Guard",
+		description: "",
+		description5e: "",
+		descriptionPf2e: "–2 circumstance penalty to AC. (Formerly flat-footed.)",
+		iconName: "ShieldOff",
+		color: "amber",
+		systems: ["pf2e"],
+	},
+	{
+		id: "quickened",
+		label: "Quickened",
+		description: "",
+		description5e: "",
+		descriptionPf2e:
+			"Gain 1 extra action at the start of your turn each round (limited uses specified by the effect).",
+		iconName: "Zap",
+		color: "green",
+		systems: ["pf2e"],
+	},
+	{
+		id: "sickened",
+		label: "Sickened",
+		description: "",
+		description5e: "",
+		descriptionPf2e:
+			"–X status penalty to all checks and DCs. Can't willingly ingest anything. Reduce by retching (Fortitude save).",
+		iconName: "Droplet",
+		color: "green",
+		systems: ["pf2e"],
+		valued: true,
+	},
+	{
+		id: "slowed-pf2e",
+		label: "Slowed",
+		description: "",
+		description5e: "",
+		descriptionPf2e: "Lose X actions at the start of your turn each round.",
+		iconName: "Snail",
+		color: "sky",
+		systems: ["pf2e"],
+		valued: true,
+	},
+	{
+		id: "stupefied",
+		label: "Stupefied",
+		description: "",
+		description5e: "",
+		descriptionPf2e:
+			"–X status penalty to Int/Wis/Cha-based checks and DCs, including spell attack rolls and spell DCs. DC 5 + X flat check to cast spells or lose the spell.",
+		iconName: "BrainCog",
+		color: "violet",
+		systems: ["pf2e"],
+		valued: true,
+	},
+	{
+		id: "undetected",
+		label: "Undetected",
+		description: "",
+		description5e: "",
+		descriptionPf2e:
+			"Location unknown. Must pick a square to target; DC 11 flat check. Attacker is off-guard against your attacks.",
+		iconName: "Ghost",
+		color: "violet",
+		systems: ["pf2e"],
+	},
+	{
+		id: "wounded",
+		label: "Wounded",
+		description: "",
+		description5e: "",
+		descriptionPf2e:
+			"Next time you gain dying, add wounded value to dying value. Wounded 1 when you recover from dying; increases if already wounded.",
+		iconName: "HeartCrack",
+		color: "red",
+		systems: ["pf2e"],
+		valued: true,
+	},
 ] as const;
 
 export const VALID_CONDITION_IDS: ReadonlySet<string> = new Set(
@@ -213,6 +520,6 @@ export function getConditionsForEdition(
 	edition: RulesEdition,
 ): readonly ConditionDefinition[] {
 	return CONDITION_DEFINITIONS.filter(
-		(d) => d.edition === undefined || d.edition === edition,
+		(d) => d.systems === undefined || d.systems.includes(edition),
 	);
 }

packages/domain/src/creature-types.ts

@@ -101,6 +101,62 @@ export interface BestiaryIndex {
 	readonly creatures: readonly BestiaryIndexEntry[];
 }
 
+export interface Pf2eCreature {
+	readonly system: "pf2e";
+	readonly id: CreatureId;
+	readonly name: string;
+	readonly source: string;
+	readonly sourceDisplayName: string;
+	readonly level: number;
+	readonly traits: readonly string[];
+	readonly perception: number;
+	readonly senses?: string;
+	readonly languages?: string;
+	readonly skills?: string;
+	readonly abilityMods: {
+		readonly str: number;
+		readonly dex: number;
+		readonly con: number;
+		readonly int: number;
+		readonly wis: number;
+		readonly cha: number;
+	};
+	readonly items?: string;
+	readonly ac: number;
+	readonly acConditional?: string;
+	readonly saveFort: number;
+	readonly saveRef: number;
+	readonly saveWill: number;
+	readonly hp: number;
+	readonly immunities?: string;
+	readonly resistances?: string;
+	readonly weaknesses?: string;
+	readonly speed: string;
+	readonly attacks?: readonly TraitBlock[];
+	readonly abilitiesTop?: readonly TraitBlock[];
+	readonly abilitiesMid?: readonly TraitBlock[];
+	readonly abilitiesBot?: readonly TraitBlock[];
+	readonly spellcasting?: readonly SpellcastingBlock[];
+}
+
+export type AnyCreature = Creature | Pf2eCreature;
+
+export interface Pf2eBestiaryIndexEntry {
+	readonly name: string;
+	readonly source: string;
+	readonly level: number;
+	readonly ac: number;
+	readonly hp: number;
+	readonly perception: number;
+	readonly size: string;
+	readonly type: string;
+}
+
+export interface Pf2eBestiaryIndex {
+	readonly sources: Readonly<Record<string, string>>;
+	readonly creatures: readonly Pf2eBestiaryIndexEntry[];
+}
+
 /** Maps a CR string to the corresponding proficiency bonus. */
 export function proficiencyBonus(cr: string): number {
 	const numericCr = cr.includes("/")

packages/domain/src/events.ts

@@ -112,12 +112,14 @@ export interface ConditionAdded {
 	readonly type: "ConditionAdded";
 	readonly combatantId: CombatantId;
 	readonly condition: ConditionId;
+	readonly value?: number;
 }
 
 export interface ConditionRemoved {
 	readonly type: "ConditionRemoved";
 	readonly combatantId: CombatantId;
 	readonly condition: ConditionId;
+	readonly value?: number;
 }
 
 export interface ConcentrationStarted {

packages/domain/src/index.ts

@@ -13,6 +13,7 @@ export {
 export {
 	CONDITION_DEFINITIONS,
 	type ConditionDefinition,
+	type ConditionEntry,
 	type ConditionId,
 	getConditionDescription,
 	getConditionsForEdition,
@@ -23,6 +24,7 @@ export {
 	createPlayerCharacter,
 } from "./create-player-character.js";
 export {
+	type AnyCreature,
 	type BestiaryIndex,
 	type BestiaryIndexEntry,
 	type BestiarySource,
@@ -31,6 +33,9 @@ export {
 	creatureId,
 	type DailySpells,
 	type LegendaryBlock,
+	type Pf2eBestiaryIndex,
+	type Pf2eBestiaryIndexEntry,
+	type Pf2eCreature,
 	proficiencyBonus,
 	type SpellcastingBlock,
 	type TraitBlock,
@@ -87,6 +92,7 @@ export type { ExportBundle } from "./export-bundle.js";
 export { deriveHpStatus, type HpStatus } from "./hp-status.js";
 export {
 	calculateInitiative,
+	calculatePf2eInitiative,
 	formatInitiativeModifier,
 	type InitiativeResult,
 } from "./initiative.js";
@@ -127,6 +133,8 @@ export {
 	toggleConcentration,
 } from "./toggle-concentration.js";
 export {
+	decrementCondition,
+	setConditionValue,
 	type ToggleConditionSuccess,
 	toggleCondition,
 } from "./toggle-condition.js";

packages/domain/src/initiative.ts

@@ -20,6 +20,14 @@ export function calculateInitiative(creature: {
 	return { modifier, passive: 10 + modifier };
 }
 
+/**
+ * Returns the PF2e initiative result directly from the Perception modifier.
+ * No proficiency bonus calculation — PF2e uses Perception as-is.
+ */
+export function calculatePf2eInitiative(perception: number): InitiativeResult {
+	return { modifier: perception, passive: perception };
+}
+
 /**
  * Formats an initiative modifier with explicit sign.
  * Uses U+2212 (−) for negative values.

packages/domain/src/rehydrate-combatant.ts

@@ -1,4 +1,4 @@
-import type { ConditionId } from "./conditions.js";
+import type { ConditionEntry, ConditionId } from "./conditions.js";
 import { VALID_CONDITION_IDS } from "./conditions.js";
 import { creatureId } from "./creature-types.js";
 import { VALID_CR_VALUES } from "./encounter-difficulty.js";
@@ -16,13 +16,30 @@ function validateAc(value: unknown): number | undefined {
 		: undefined;
 }
 
-function validateConditions(value: unknown): ConditionId[] | undefined {
+function validateConditions(value: unknown): ConditionEntry[] | undefined {
 	if (!Array.isArray(value)) return undefined;
-	const valid = value.filter(
-		(v): v is ConditionId =>
-			typeof v === "string" && VALID_CONDITION_IDS.has(v),
-	);
-	return valid.length > 0 ? valid : undefined;
+	const entries: ConditionEntry[] = [];
+	for (const item of value) {
+		if (typeof item === "string" && VALID_CONDITION_IDS.has(item)) {
+			entries.push({ id: item as ConditionId });
+		} else if (
+			typeof item === "object" &&
+			item !== null &&
+			typeof (item as Record<string, unknown>).id === "string" &&
+			VALID_CONDITION_IDS.has((item as Record<string, unknown>).id as string)
+		) {
+			const id = (item as Record<string, unknown>).id as ConditionId;
+			const rawValue = (item as Record<string, unknown>).value;
+			const entry: ConditionEntry =
+				typeof rawValue === "number" &&
+				Number.isInteger(rawValue) &&
+				rawValue > 0
+					? { id, value: rawValue }
+					: { id };
+			entries.push(entry);
+		}
+	}
+	return entries.length > 0 ? entries : undefined;
 }
 
 function validateHp(

packages/domain/src/rules-edition.ts

@@ -1 +1 @@
-export type RulesEdition = "5e" | "5.5e";
+export type RulesEdition = "5e" | "5.5e" | "pf2e";

packages/domain/src/toggle-condition.ts

@@ -1,4 +1,4 @@
-import type { ConditionId } from "./conditions.js";
+import type { ConditionEntry, ConditionId } from "./conditions.js";
 import { CONDITION_DEFINITIONS, VALID_CONDITION_IDS } from "./conditions.js";
 import type { DomainEvent } from "./events.js";
 import {
@@ -14,11 +14,13 @@ export interface ToggleConditionSuccess {
 	readonly events: DomainEvent[];
 }
 
-export function toggleCondition(
-	encounter: Encounter,
-	combatantId: CombatantId,
-	conditionId: ConditionId,
-): ToggleConditionSuccess | DomainError {
+function sortByDefinitionOrder(entries: ConditionEntry[]): ConditionEntry[] {
+	const order = CONDITION_DEFINITIONS.map((d) => d.id);
+	entries.sort((a, b) => order.indexOf(a.id) - order.indexOf(b.id));
+	return entries;
+}
+
+function validateConditionId(conditionId: ConditionId): DomainError | null {
 	if (!VALID_CONDITION_IDS.has(conditionId)) {
 		return {
 			kind: "domain-error",
@@ -26,38 +28,157 @@ export function toggleCondition(
 			message: `Unknown condition "${conditionId}"`,
 		};
 	}
+	return null;
+}
+
+function applyConditions(
+	encounter: Encounter,
+	combatantId: CombatantId,
+	newConditions: readonly ConditionEntry[] | undefined,
+): Encounter {
+	return {
+		combatants: encounter.combatants.map((c) =>
+			c.id === combatantId ? { ...c, conditions: newConditions } : c,
+		),
+		activeIndex: encounter.activeIndex,
+		roundNumber: encounter.roundNumber,
+	};
+}
+
+export function toggleCondition(
+	encounter: Encounter,
+	combatantId: CombatantId,
+	conditionId: ConditionId,
+): ToggleConditionSuccess | DomainError {
+	const err = validateConditionId(conditionId);
+	if (err) return err;
 
 	const found = findCombatant(encounter, combatantId);
 	if (isDomainError(found)) return found;
 	const { combatant: target } = found;
 	const current = target.conditions ?? [];
-	const isActive = current.includes(conditionId);
+	const isActive = current.some((c) => c.id === conditionId);
 
-	let newConditions: readonly ConditionId[] | undefined;
+	let newConditions: readonly ConditionEntry[] | undefined;
 	let event: DomainEvent;
 
 	if (isActive) {
-		const filtered = current.filter((c) => c !== conditionId);
+		const filtered = current.filter((c) => c.id !== conditionId);
 		newConditions = filtered.length > 0 ? filtered : undefined;
 		event = { type: "ConditionRemoved", combatantId, condition: conditionId };
 	} else {
-		const added = [...current, conditionId];
-		const order = CONDITION_DEFINITIONS.map((d) => d.id);
-		added.sort((a, b) => order.indexOf(a) - order.indexOf(b));
+		const added = sortByDefinitionOrder([...current, { id: conditionId }]);
 		newConditions = added;
 		event = { type: "ConditionAdded", combatantId, condition: conditionId };
 	}
 
-	const updatedCombatants = encounter.combatants.map((c) =>
-		c.id === combatantId ? { ...c, conditions: newConditions } : c,
-	);
-
 	return {
-		encounter: {
-			combatants: updatedCombatants,
-			activeIndex: encounter.activeIndex,
-			roundNumber: encounter.roundNumber,
-		},
+		encounter: applyConditions(encounter, combatantId, newConditions),
 		events: [event],
 	};
 }
+
+export function setConditionValue(
+	encounter: Encounter,
+	combatantId: CombatantId,
+	conditionId: ConditionId,
+	value: number,
+): ToggleConditionSuccess | DomainError {
+	const err = validateConditionId(conditionId);
+	if (err) return err;
+
+	const found = findCombatant(encounter, combatantId);
+	if (isDomainError(found)) return found;
+	const { combatant: target } = found;
+	const current = target.conditions ?? [];
+
+	if (value <= 0) {
+		const filtered = current.filter((c) => c.id !== conditionId);
+		const newConditions = filtered.length > 0 ? filtered : undefined;
+		return {
+			encounter: applyConditions(encounter, combatantId, newConditions),
+			events: [
+				{ type: "ConditionRemoved", combatantId, condition: conditionId },
+			],
+		};
+	}
+
+	const existing = current.find((c) => c.id === conditionId);
+	if (existing) {
+		const updated = current.map((c) =>
+			c.id === conditionId ? { ...c, value } : c,
+		);
+		return {
+			encounter: applyConditions(encounter, combatantId, updated),
+			events: [
+				{
+					type: "ConditionAdded",
+					combatantId,
+					condition: conditionId,
+					value,
+				},
+			],
+		};
+	}
+
+	const added = sortByDefinitionOrder([...current, { id: conditionId, value }]);
+	return {
+		encounter: applyConditions(encounter, combatantId, added),
+		events: [
+			{ type: "ConditionAdded", combatantId, condition: conditionId, value },
+		],
+	};
+}
+
+export function decrementCondition(
+	encounter: Encounter,
+	combatantId: CombatantId,
+	conditionId: ConditionId,
+): ToggleConditionSuccess | DomainError {
+	const err = validateConditionId(conditionId);
+	if (err) return err;
+
+	const found = findCombatant(encounter, combatantId);
+	if (isDomainError(found)) return found;
+	const { combatant: target } = found;
+	const current = target.conditions ?? [];
+	const existing = current.find((c) => c.id === conditionId);
+
+	if (!existing) {
+		return {
+			kind: "domain-error",
+			code: "condition-not-active",
+			message: `Condition "${conditionId}" is not active`,
+		};
+	}
+
+	const newValue = (existing.value ?? 1) - 1;
+	if (newValue <= 0) {
+		const filtered = current.filter((c) => c.id !== conditionId);
+		return {
+			encounter: applyConditions(
+				encounter,
+				combatantId,
+				filtered.length > 0 ? filtered : undefined,
+			),
+			events: [
+				{ type: "ConditionRemoved", combatantId, condition: conditionId },
+			],
+		};
+	}
+
+	const updated = current.map((c) =>
+		c.id === conditionId ? { ...c, value: newValue } : c,
+	);
+	return {
+		encounter: applyConditions(encounter, combatantId, updated),
+		events: [
+			{
+				type: "ConditionAdded",
+				combatantId,
+				condition: conditionId,
+				value: newValue,
+			},
+		],
+	};
+}

packages/domain/src/types.ts

@@ -5,7 +5,7 @@ export function combatantId(id: string): CombatantId {
 	return id as CombatantId;
 }
 
-import type { ConditionId } from "./conditions.js";
+import type { ConditionEntry } from "./conditions.js";
 import type { CreatureId } from "./creature-types.js";
 import type { PlayerCharacterId } from "./player-character-types.js";
 
@@ -17,7 +17,7 @@ export interface Combatant {
 	readonly currentHp?: number;
 	readonly tempHp?: number;
 	readonly ac?: number;
-	readonly conditions?: readonly ConditionId[];
+	readonly conditions?: readonly ConditionEntry[];
 	readonly isConcentrating?: boolean;
 	readonly creatureId?: CreatureId;
 	readonly cr?: string;