How does Suvillan punish Kotori for hiding the very human Aria? He orders Kotori to kill her with her bare hands, and then proceeds to make a not so subtle threat.
Also disturbing is the sheer apathy of which the two nobles talk about the incident, to the point that after one of them relays the full story, the other simply remarks "How distasteful."
Shortly after Nino falls into the cavern, something hidden in darkness sneaks up on him in the water. When he turns around, it's not an enemy. It's his own mutilated corpse, and not only one of them. Thankfully, it turns out to be a bunch of illusions, but it's nonetheless horrific.