1989 · ソースブック（プレイを拡張するルール／オプション）
Elder Secrets of Glorantha
This supplement presents little-known secrets of Glorantha, with a focus on its Elder Races and the mysteries of the Third Age. It describes inaccessible lands, unique places and objects, dragonkind, rare creatures, geology, weather, the sky, and the beginnings of heroquesting and the Hero Wars. Detailed sections cover the Mostali, Aldryami, and Uz, including their cults, while shorter entries introduce 19 lesser Elder Races and two additional cults. Scenario outlines involving these races and a map showing their major concentrations are also included.
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）ランダム属性生成（キャラクター作成時）
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。