Sol

Sol Badguy resides in the mountain Suuth'Kallos, and seems responsible for the general upkeep of its interior. He has a set of scales to balance peoples souls against that of a wolf and although he's very particular about doing it to any who enter, he doesn't seem to care much for the outcome.
He told Finn lots of lore, mainly that the mountain was responsible for keeping some prisoners in (or out) and so it's attention wasn't exactly present currently. He also explained that a creature was escaping from somewhere, somewhere guarded by three keys. The increbible plan Sol presented was to find those three keys, then open the door and let the creature out so we can fight it.
We didn't do his plan.