Cheats, Hints, Tips, whatever you want to call it...

 

Unlock Alternative Hunter Mode
Complete the game once to have the option of playing the Hunters with their imbuing clothing
Posted by Polar Bear

Unlock Nightmare Mode
Complete the game once to be able to face certain suicide.
Posted by Polar Bear

Beating the Warden
Just use the chainsaw, it works really well and kills the vampire extremely quickly. But, if you really want to witness "eternity", go about it your own little way.
Posted by Polar Bear

Beating Dr. Hadrian
As any character, grab the chainsaw in the room right before the red doorway. If you are the Martyr, cast Retribution as usual, otherwise and still use the chainsaw to slice this little fiend's fleshcrafted body into many pieces, and then witness his work go up into flames.
Posted by Polar Bear

Beating Carpenter
When you are trying to beat Carpenter, use the Martyr and make sure you have a flame thrower and rocket launcher. As soon as you get to him, use the rocket launcher to blow up the electric chair (about 6-7 direct hits) then switch to the flame thrower. Cast Retribution and run like heck and spray him with the flame thrower when he stops to try and cut you. Takes a little while but I found this technique to be the most effective.
Posted by Polar Bear

Beating the Werewolves
Okay, most of us know the little thing about how silver bullets kill werewolves. Obviously the Messengers gave us silver ammo in our machine guns and shotguns, because they work. Use them.
Posted by Polar Bear

Beating the Warden (again)
As any character, grab the machine gun at the lower left of the screen. Use any weapon to hurt the Boss. When he goes to recharge, run to the big window in the room and unload your Rocket Launcher, Shotgun, Chainsaw, or other weapon into it until it breaks open and the Boss dies. You can pretty much ignore him when he returns from getting charged, since you will be standing on a Health Glyph while destroying the window. Vampire and sunlight equals death.
Posted by Polar Bear