2018 · ソースブック（プレイを拡張するルール／オプション）
Oldskull Monster Generator
A tabletop role-playing supplement for creating original monsters in First and Fifth Edition fantasy campaigns. Guided-random tables and worksheets generate creatures from challenge rating or monster level, body type, abilities, themes, senses, languages, statistics, attacks, quirks, and vulnerabilities. The book also covers summoners, cultists, binders, and minions, along with monstrous events such as rituals, madness, parley, trophy harvesting, resurrection, and journeys into Dream Worlds. A Lovecraftian glossary, example-driven design guidance, quotations, and illustrations support the creation and integration of strange, old-school-inspired encounters.
属性／ステータス制（STR、CON、PERなど）レベル制（XPを獲得してレベルアップ）ダイス（主にd20）
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。