diff --git a/package-lock.json b/package-lock.json
index 4821f8453..0ab27d7b2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -52,7 +52,7 @@
 				"less": "^4.1.3",
 				"less-loader": "^11.1.0",
 				"lint-staged": "^13.2.3",
-				"prettier": "2.5.1",
+				"prettier": "^2.8.0",
 				"style-loader": "^3.3.1",
 				"terser-webpack-plugin": "^5.3.6",
 				"ts-loader": "^9.4.2",
@@ -10666,15 +10666,18 @@
 			}
 		},
 		"node_modules/prettier": {
-			"version": "2.5.1",
-			"resolved": "https://registry.npmjs.org/prettier/-/prettier-2.5.1.tgz",
-			"integrity": "sha512-vBZcPRUR5MZJwoyi3ZoyQlc1rXeEck8KgeC9AwwOn+exuxLxq5toTRDTSaVrXHxelDMHy9zlicw8u66yxoSUFg==",
+			"version": "2.8.8",
+			"resolved": "https://registry.npmjs.org/prettier/-/prettier-2.8.8.tgz",
+			"integrity": "sha512-tdN8qQGvNjw4CHbY+XXk0JgCXn9QiF21a55rBe5LJAU+kDyC4WQn4+awm2Xfk2lQMk5fKup9XgzTZtGkjBdP9Q==",
 			"dev": true,
 			"bin": {
 				"prettier": "bin-prettier.js"
 			},
 			"engines": {
 				"node": ">=10.13.0"
+			},
+			"funding": {
+				"url": "https://github.com/prettier/prettier?sponsor=1"
 			}
 		},
 		"node_modules/prettier-linter-helpers": {
diff --git a/package.json b/package.json
index e264d37d5..9da4d4250 100644
--- a/package.json
+++ b/package.json
@@ -66,7 +66,7 @@
 		"less": "^4.1.3",
 		"less-loader": "^11.1.0",
 		"lint-staged": "^13.2.3",
-		"prettier": "2.5.1",
+		"prettier": "^2.8.0",
 		"style-loader": "^3.3.1",
 		"terser-webpack-plugin": "^5.3.6",
 		"ts-loader": "^9.4.2",
diff --git a/src/data/types.ts b/src/data/types.ts
index 4eb2b671a..1c862ee4f 100644
--- a/src/data/types.ts
+++ b/src/data/types.ts
@@ -1,5 +1,7 @@
 import { unitData } from './units';
 
+export type UnitData = typeof unitData;
+
 // Enables autocomplete for `key`
 function getKeyValue<T extends object, K extends keyof T>(obj: T, key: K) {
 	return obj[key];
@@ -10,16 +12,21 @@ const realms = unitData.map((unit) => getKeyValue(unit, 'realm'));
 const unitNames = unitData.map((unit) => getKeyValue(unit, 'name'));
 const unitLevels = unitData.map((unit) => getKeyValue(unit, 'level'));
 
-// Create an array containing the possible `creature.type` combinations.
-// In `game.ts`: creature.type = realm.toUpperCase() + level,
-const creatureTypes = realms.map((realm) => {
-	for (let i in unitLevels) {
-		return `${realm}${unitLevels[i]}` as const;
-	}
-});
+/*
+ * A creature's `type` is defined as `creature.realm` + `creature.level`
+ * Example: Dark Priest has `type` '--'
+ *
+ * This type helper makes it possible to exclude creature `type` combinations that don't actually exist on a creature
+ * For example: The combinations '-1' and 'A-' currently are not in use by any creature
+ */
+type ExtractValidCreatureTypes<T extends UnitData> = {
+	[key in keyof T]: `${T[key]['realm']}${T[key]['level']}`;
+}[number];
 
 // Create unions from the various arrays
-export type UnitName = typeof unitNames[number];
-export type Realm = typeof realms[number];
-export type Level = typeof unitLevels[number];
-export type CreatureType = typeof creatureTypes[number];
+export type UnitName = (typeof unitNames)[number];
+export type Realm = (typeof realms)[number];
+export type Level = (typeof unitLevels)[number];
+
+// Create a union of valid creature `type`s
+export type CreatureType = ExtractValidCreatureTypes<UnitData>;
diff --git a/src/data/units.ts b/src/data/units.ts
index 0ef992bdf..1dcf6a80a 100644
--- a/src/data/units.ts
+++ b/src/data/units.ts
@@ -1,3 +1,76 @@
+type Stats = {
+	health: number;
+	regrowth: number;
+	endurance: number;
+	energy: number;
+	meditation: number;
+	initiative: number;
+	offense: number;
+	defense: number;
+	movement: number;
+	pierce: number;
+	slash: number;
+	crush: number;
+	shock: number;
+	burn: number;
+	frost: number;
+	poison: number;
+	sonic: number;
+	mental: number;
+};
+
+type UnitDataStructure = readonly {
+	id: number;
+	name: string;
+	playable: boolean;
+	level: number | string;
+	realm: string;
+	size: number;
+	stats: Stats;
+	animation: { walk_speed: number };
+	type?: string;
+	drop?: { name: string } & Partial<Stats>;
+	movementType?: 'hover';
+	display?: { width: number; height: number; 'offset-x': number; 'offset-y': number };
+	set?: 'α' | 'β';
+
+	ability_info: readonly {
+		title: string;
+		desc: string;
+		info: string;
+		upgrade?: string;
+		affectedByMatSickness?: number;
+		details?: readonly string[];
+		effects?: readonly {
+			special?: string;
+			regrowth?: number;
+			offense?: number;
+			defense?: number;
+			frost?: number;
+		}[];
+		maxCharge?: number;
+		requirements?: { plasma: number; energy?: number };
+		damages?: {
+			special?: string;
+			shock?: number | string;
+			pure?: number | string;
+			pierce?: number;
+			slash?: number;
+			crush?: number;
+			burn?: number;
+			poison?: number;
+			frost?: number | string;
+			mental?: number;
+			sonic?: number;
+		};
+		bonus_damages?: { frost: number; pierce: number };
+		damages1?: { burn?: number; pierce?: number; poison?: number };
+		costs?: { plasma?: number | string; special?: string; energy?: number; movement?: string };
+		range?: { regular: number; upgraded: number; minimum?: number };
+		animation_data?: { duration: number; delay: number };
+	}[];
+}[];
+
 export const unitData = [
 	{
 		id: 0,
@@ -3927,7 +4000,7 @@ export const unitData = [
 		id: 50,
 		name: 'Shadow Leech',
 		playable: false,
-		level: '1',
+		level: 1,
 		realm: 'W',
 		size: 1,
 		set: 'α',
@@ -3996,4 +4069,4 @@ export const unitData = [
 			},
 		],
 	},
-] as const;
+] as const satisfies UnitDataStructure;