2005 · ソースブック（プレイを拡張するルール／オプション）
Guardians of the Underhalls
This sourcebook presents a druid class variant devoted to protecting the lands beneath the surface. It introduces an underground-focused approach to guardianship, along with a revised form of wild shape, new poisons, and spells suited to subterranean campaigns. Much of the spell material is drawn from earlier supplements, while the class and several other elements are original. Optional rules that replace material from previous editions are clearly marked for evaluation by the Dungeon Master.
ダイス（各種）クラス制（パイロット、ウィザード、サイエンティストなど）スキルベース（スキルを購入または獲得）
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。