2002 · ソースブック（プレイを拡張するルール／オプション）
The Fir Domain
This supplement explores one of the tribes of Tir Nan Og in the Slaine RPG, known for its disciplined warriors, powerful shields, and careful use of force. It covers the tribe’s history, traditions, defensive battle tactics, distinctive magic, and notable personalities. Players gain background for creating characters from the tribe, while Games Masters receive information for developing Non-Player Characters and scenario hooks connected to its important figures.
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。