When inside the castle, an obstacle blocks your path (two fire breathing statues) To shut it off, you must enter the prison (the key is on a painting near the obstacle). When you go into the prison, equip either the TMP or shotgun and tell Ashley to wait atop the stairs. After the intermission sequence showing what the boss looks like, kick down the cell door and get close to the switch to initiate the battle. If you go up the stairs to try to escape, the door will shut. Try walking as much as possible, as he is sensitive to sound. You can use the bells at each end of the prison by shooting at them, but they can only be used once. Stay close to walls so that he gets stuck when he tries to attack you. Do your best to avoid his attacks, as they take much damage and there is only one Green Herb in the area. His only weakness is the spider thing on his back. When he is stuck in a wall, concentrate all of your firepower on the the weak point until he recuperates. After awhile, he will let his guard down and walk around. This is when he is most vulnerable, besides when he is stuck in a wall. Repeat this as many times as needed to kill him. When you put Ashley atop the steps, she is out of harm's way. Additionally, make sure that he is closer to the bell than he is to you. Shoot it with your handgun. If he is closer to you, he hears the gunshot. Then, switch to the rifle and aim just in front of the bell. If you aimed well and timed your shot correctly, you can shoot him in the back before he destroys the bell.
