After developing magic to breathe underwater, Gygar leads a team of mages to explore the sunken ruins of Gravehold. There he finds an abandoned girl who has learned to fend for herself and a familiar face who has come to terms with his own darkness. But humans aren't the only creatures lurking in this subterranean city. Return to Gravehold is an expansion for the cooperative deck-building game Aeon's End. This expansion includes two mages, two nemeses and several new player cards and treasures.