2006 · ソースブック（プレイを拡張するルール／オプション）
Party Synergy
This rules supplement expands cooperative play in d20 fantasy adventures. It introduces the Share Knowledge skill, which lets one character coach another for temporary bonuses or, in some cases, additional skill ranks without gaining a level. The supplement also presents 13 synergy maneuvers for coordinated actions, including the defensive Shield Wall, the offensive Phalanx, and the demanding Superior Forced March. Each maneuver provides specific effects that reward characters for working together.
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。