User blog comment:Jyggalag Daedric Prince of Order/New Monsters For Future Seasons?/@comment-83.252.22.120-20130604161912/@comment-91.117.145.122-20140828154926

I thik that a Hydra shows in human form as a very fat man or woman. When no one is around they split part of their mass  in the form of a snake of unknow species. Since the hydra regenerates very fast, the old humans seen them as inmortal. The legend of it's death is about their weakneses: every one of their snakes split in two when they are harmed but fire block their regeneration. But with these snakes dead they are still coming so the brothers need to find the human identity of the central monster and decapitate him/her. Due to their regenerative hability, the head and the body need to be burned to be sure, moment in that all the snakes die permanently.