2013 · ソースブック（プレイを拡張するルール／オプション）
Irrisen: Land of Eternal Winter
This campaign setting guide details a northern realm trapped in unending winter and ruled by the White Witches, descendants of Baba Yaga. It explores Irrisen’s six provinces, history, holidays, settlements, and notable locations, with maps of its towns and cities. The book includes adventure sites, events, hazards, afflictions, provincial and capital stat blocks, and a bestiary of local monsters and NPCs, including winter witches, frost giants, and Baba Yaga’s Three Riders. It is designed for fantasy roleplaying campaigns and can be adapted to other game systems.
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）クラス制（パイロット、ウィザード、サイエンティストなど）
無料・Web、Android、iOS対応
LudoyaでIrrisen: Land of Eternal Winter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。