The walls of the castle look even more daunting when the lighter are all off. Most denizens would be sleeping by now, but you know at least one person would be awake at this time. Knocking on the walls of Diavolo's castle you hope there's a response, but for a second there is none.

Your tongue rubs against your fangs absentmindedly as you wait. The door flings open, and Barbatos looks at you with a polite smile. "I didn't expect to see you here so late."