2001 · ソースブック（プレイを拡張するルール／オプション）
The Way of the Ratling
This sourcebook details the Nezumi, a once-proud race struggling to survive in Rokugan. Living near the Kaiu Wall, in the Shinomen forests, and across the Shadowlands, they fight alongside the Crab against the Tainted creatures that have taken their lands. It includes rules for creating Nezumi player characters and tribes, along with their history, prominent tribes, language, alliances, and unique shamanic magic based on the power of names. The book also covers the Tattered Ear Tribe and the Nezumi’s relationships with the Crab and other clans.
スキルベース（スキルを購入または獲得）特性／アスペクト制（性格がゲームプレイに影響する）ダイスプール（目標に対して複数のダイスを振る）
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。