2005 · ソースブック（プレイを拡張するルール／オプション）
Klingons d20: The Empire Of Steel (Complete Imperial Data File)
A d20 sourcebook covering the history, culture, government, military, religion, law, and technology of the Klingon Empire. It includes profiles of Klingon society, intelligence agencies, secret police, Imperial Paladins, military nobility, and subject races. The book provides data on 23 star systems, more than 100 planets, over 100 starship types and variants, weapons, equipment, medals, rank insignia, and deck plans for a fast patrol ship. It also includes an adventure involving a deal on Verlix Station and an experimental project led by Lieutenant Thirek.
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）
無料・Web、Android、iOS対応
LudoyaでKlingons d20: The Empire Of Steel (Complete Imperial Data File)を遊ぼう
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。