[Suzerain of Sheol]

Yeah, it's really a whole new experience playing in co-op. The difficulty pretty much goes out the window (which might have to do with me bringing my endgame character into Quiet's world...), but you still have to be on your toes, since you're never really safe in Dark Souls, and especially for bosses, one wrong hit and it's all over. Plus, being in a group makes you get invaded more or less constantly, so the challenge is really replaced by trying to outplay and out-think human opponents. Really breathes new life into the game.