Board Thread:General Discussion/@comment-4010415-20141223120240/@comment-25555436-20150114022009

....Facepalm. It's not similar to the hydra at all. Heck, if all you got is "multiple heads", then we could say it's loosely based on Escilla too, or tons of other mythological creatures.

I think I know in what it is based on. I'll give you a hint: It starts with J, ends with d, it's huge, kills a god in the end of the world, and has an anime with the exact same name.