Sothis Ascends is a sourcebook for Mummy: The Curse. This book examines the Sothic Turn; the cycle of existence within which Mummies live and die. Since their creation, there have been five Turns and each is examined: one part historical setting, one part grab-bag of artifacts, powers, and antagonists. Also presents the final "chapter" of the three-part adventure, with thematic content relating to the Turns.