Board Thread:Antaeus' Arena: Audience Chamber/@comment-1515612-20160210164601/@comment-27790000-20160226150219

Because the River Styx is a part of the Underworld. I'm not sure, however, because it doesn't seen possible for Hades to summon water from the River Styx on neutral ground, away from the Underworld. And the idea also sounds a bit, I don't know, hilarious? If Poseidon survived, it would make him invincible, giving a great disadvantage to Hades.