Hint: Defeating Faustus:
At first, you are in a small circle room with two doors. All you have to do is face the Boss and hold R1 + L1 (Attack and Block). Wait for him to attack. He has four different types. In the first, he does a five or six hit combo. In the second, he can punch, then kick. In the third, he will just kick. In the fourth, he jumps back with a red glow and lunges forward. When he uses his first type of attack, wait until he punches a third time, then release your block and attack. Repeat this about five times to continue. In the next room you must use the mist form to sneak up to the furnace and burn him. To do this, you must first find the two furnaces with fog in front of them. They are on opposing sides. When you first enter the room, one is to the left and the other is to the right. Run around until he jumps to one of the two, then sneak to the corner and turn mist on. Slowly walk to the switch and fry him. Finally, he will jump around and lunge at you. Just run around until he lunges. This will cause him to eventually fall. Run up to him and use a combo. This must be done about three or four times in order to defeat him.

Keep blocking and sidestepping his attacks while finding open spots for attack until you get about one quarter of his life down. Then, he will run off and enter a room will large heaters and mist around them. When Faustus jumps on to a heater, proceed towards the beginning of the mist trail that leads to the heater and pull the switch to hurt him. Keep repeating this procedure until he jumps up on to a chain, then run to a corner of the room and stay there until Fautus jumps down . He will now try to jump and kick you from far away. If you sidestep his attack, he will hit the wall and will be vulnerable for a few seconds. Keep repeating this until he is dead.

Hint: Defeating Marcus:
You will fight Marcus in a cathedral, on the bottom floor first. On the left and right sides of the room are switches, one on each side. These switches activate bells which disrupt Marcus' concentration and leave him vulnerable for a short time. Hit one switch, then run to the other switch, hitting Marcus on the way. Continue this until his "puppets" disable the bells. Go up to the second floor. Marcus will just run around until you kill him. Use the jump ability to alternate between sides, hitting him on the way. Once he dies, you obtain the Charm ability.

Glitch: Stuck in forge:
On the ledge in the swamp just in front of the first forge (the dark forge) are some crows. Do not go near them. If you do, you can still get inside but you can never open the door again to get out. Getting out requires an intermission sequence with Voridor. Since the crows are his messengers, if they disappear the intermission sequence will not happen thus, you cannot get out