2002 · ソースブック（プレイを拡張するルール／オプション）
Monster's Handbook
A d20 System resource for creating, modifying, and using monsters in fantasy campaigns. It includes more than 60 monster feats, prestige classes, special attacks, qualities, traits, and templates that can be applied to different creature types. The book provides guidelines for adding abilities and adjusting Challenge Ratings, along with advice on combining monsters with feats, skills, classes, and magic items. Sample creatures illustrate the rules and offer ideas for introducing new challenges into a campaign.
- プレイ人数
- 0
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）ダイス（主にd20）ダイス（各種）
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。