2014 · ソースブック（プレイを拡張するルール／オプション）
Midgard Bestiary (13th Age)
A 13th Age-compatible bestiary presents 100 strange monsters and NPCs from the Midgard setting, including steam golems, ice maidens, fellforged warriors, undead, fey, spellcasters, and various dwarf and elf foes. Each entry includes adventure hooks and a list of likely treasure or possessions. The book also adds nine player character races, such as ghouls, gearforged, kobolds, and ravenfolk, along with 13 setting icons and creatures drawn from locations including Zobeck, the Empire of the Ghouls, the shadow fey courts, and the Wasted West.
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ダイス（主にd20）レベル制（XPを獲得してレベルアップ）種族ベース（プレイヤーの種族/種がゲームプレイに影響する）
ゲーム情報（人数、プレイ時間、対象年齢、クレジット）の出典：BoardGameGeek。