In the depths of Hell.

Okay, fine. I dealt with the demons, but they weren't the right ones. I got the Cerberus artifact. I just killed Grok. Only devils remain. There was only one of them. They said they wouldn't be friends without a fight. I clicked "OK" - the battle began. After it - blah-blah-blah, we'll tell everything to the Devil. And they disappeared. Those guys?