This is an expansion and requires the base game to play: Yes

Deep within the earth, lost in the labyrinth of shadows, the Horde-Crone has awakened the troggs to reclaim the ancient city of Gravehold.

The Depths is an expansion for the cooperative deckbuilding game Aeon's End. This expansion features one new nemesis and three new breach mages, as well as new spells, relics, gems, and minions.