Magic Puddle

A small oasis in the wastelands. Upon draining a large underground ruin was discovered. In this ruin was a sealed door which the ROD in ROD fashion unsealed. On the other side of that door was a portal. The ROD went through that portal, and it was at this moment they knew they fucked up. It was not just a 'portal', it was a door way to what appeared to be hell. That's right, ROD once again unleashed calamity and hell into the world... Just kidding, they went in and slaughtered hordes of demons and discovered the mages faithful hound was deaf, blind and mute. They did succeed in closing the portal saving the material plane from an invasion from hell.