The Hidden Chamber is the fourth secret area in Circle of Blood. It is linked to the Forsaken Cloister, under a massive Demon statue that can be destroyed by attacking it with the Fire, Ice, and Thunder weapons. The theme is Castle Center. In the exact center of the Chamber is a room with a statue in the middle. The four lights around the room must be turned on using the keys from the elemental bosses, and they will light up the statue, which reveals a door to another area.
- Skeleton (bone-throwing)
- Floating Skull