One of my players is playing a warlock, a class that I don't have much experience with. We all trust each other, etc, etc, so I don't know all the inn-and-outs of everybody's character, especially this warlock. Nobody tries to brake the game by entering the wish economy, or something similar, and we generally just disregard that the party is running around with a huge weight in coins.
Anyhow, my question... The warlock wants to "bond" (or whatever the word was that he used) a Demon, to give him some special abilities or somesuch. I don't know anything about that, but I'd love to have it in the game, since it fits kinda good with his backstory and it's a fun thing to do. How does this bonding works? Can I find some info on it somewhere, or do one of you guys know anything about it?
Cheers!
Erik