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 are not 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 features two mages, two nemesis, and several new player cards and treasures.