2007 · シナリオ／アドベンチャー／モジュール
Ariadne's Diadem
During the great reconstruction of Alphatia in Mystara’s Hollow World, the Immortals deactivate the Spell of Preservation, disrupting the enchantment that once kept societies isolated and imprisoned the ancient Burrowers. These highly intelligent Entropic creatures begin to awaken, bringing terror, madness, and death to the world. As Alphatia expands its influence through a network of client and patron relationships, rival powers pursue their own claims. This d20 adventure continues and concludes the events of Ariadne’s Necklace, challenging four to six experienced players to confront threats that endanger the entire Hollow World.
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。