After navigating the Clock Tower and hitting the four gears, a path will open leading to the boss, Karasuman. This fight takes place in a relatively small room.

Strategy:
- Karasuman is a large crow-like demon who flies around the room, summoning smaller crows and occasionally swooping down to attack.
- Phase 1: He primarily flies in a predictable pattern, summoning groups of three smaller crows. Focus on dodging the crows and hitting Karasuman whenever he is within reach. A good strategy is to jump and attack him as he flies horizontally across the screen.
- Phase 2: After taking significant damage, Karasuman will start to perform a dive-bomb attack. He'll fly to the top of the screen, pause, and then quickly dive towards Alucard's last position. Anticipate this and backdash or jump out of the way. Continue to attack him during his recovery frames.
Reward: Defeating Karasuman grants you access to Olrox's Quarters.