2004 · ソースブック（プレイを拡張するルール／オプション）
The Hidden Emperor
A campaign sourcebook for the Legend of the Five Rings roleplaying game, covering the War Against the Darkness and the Jade Edition story arc. Emperor Toturi I has vanished, the Scorpion Clan stands accused, and the Great Clans descend into war as an ancient force moves against the Empire. The book provides a complete campaign, an updated historical account of this period in Rokugan, adventure hooks, new mechanics, and statistics for more than forty important characters. It includes both d10 and d20 system statistics, with material for Second Edition L5R and the Rokugan d20 setting.
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キャンペーン設定（ゲーム世界）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。