Hamidon (Praetorian)
The Praetorian Hamidon cannot yet be found in the game, but it has been described as a giant lovecraftian monster with tentacles and claws.
While the Hamidon itself has not been directly introduced into combat with players, in can be indirectly fought through two of its "children," the Seed of Hamidon and the Avatar of Hamidon. In addition, tentacles of the Hamidon can be seen emerging from the destroyed portion of First Ward in the Sunken City neighborhood.