To activate the Witchaven cheat codes, press the backspace key.
If it's right, everything on the screen will stop all at once, even in the middle of fights. Type in one of the following cheat codes now. At the top of the screen, you'll see the cheat code you are typing.
There are only three codes I've found so far, but they seem to take care of most everything.

MOMMY = Gives 9 of every potion and spells.
WANGO = Gives full health, and armor, all keys and makes you level 7
SCOOTER = Gives all the weapons, spells and a full load of pikes

There are 3 extra codes, IDKFA, RAMBO, and RSVP, that do nothing except kill you on the spot