Akaneia Chronicles Chapter 4 is the only one to feature a Bonus Boss of sorts. You're not required to kill him to complete the chapter, and doing so is very difficult due to the constant reinforcements you have to fight your way through. But actually acomplish this feat and, instead of the boss taunting Camus at the chapter's end Medeus himself fills the role, and comments that no human has ever put up this much of fight against him since Anri. He seems to consider Camus a Worthy Opponent for pulling this off. The conversation is partly a case of Breaking the Fourth Wall: it's just as much the player being praised for their awesomeness as Camus.