Aku'mai is a giant hydra and acts as final boss of Blackfathom Deeps. According to legend, Aku'mai has taken up residence within Blackfathom Deeps, which once was a glorious temple dedicated to the night elves' moon-goddess Elune. Aku'mai, a favored pet of the primordial Old Gods, has preyed upon the area ever since. Drawn to the hydra's presence, the cult known as Twilight's Hammer has also come to bask in the Old Gods' evil presence and sacrifice innocents to her to gain power. Aku'mai is not an Old God, just one of their favorite pets.