2003 · ソースブック（プレイを拡張するルール／オプション）
Dinosaurs That Never Were
A d20 monster manual presents game statistics and background for 50 fictional dinosaurs that evolved on the planet Cretasus. Found in Storm Valley, these creatures range from tiny specialized species to vicious predators and 90 HD behemoths. The book also details the valley, its inhabitants, human colonization attempts, and military presence, with reference tables organizing the dinosaurs by Challenge Rating and terrain.
スキルベース（スキルを購入または獲得）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）
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。