2014 · ソースブック（プレイを拡張するルール／オプション）
Ninth World Assassins
This Numenera supplement explores the methods, profession, and philosophy of Ninth World assassins, along with the relationships between assassins and their clients. It introduces new character descriptors and foci, more than 30 poisons, over 20 traps, and a guild system for joining and advancement. The book also includes new ways to use experience points, artifacts and oddities, five dangerous creatures and NPCs, and 14 assassin-themed campaign hooks for players and GMs.
スキルベース（スキルを購入または獲得）特性／アスペクト制（性格がゲームプレイに影響する）属性／ステータス制（STR、CON、PERなど）
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。