Start the game with -console added at the end. (d:\games\Vampire\vampire.exe -console) . (Make a shortcut on your desktop and right click the shortcut and edit the properties to accomplish this)
Then when in game just press tilde (~) and type the following code of choice:
God = Invincible
Give item_ = Gives you the item of your choice, just press up or down to cycle through available items.
Giftxp = Gives you the amount of experience points you want. (Don't use the < >)
Debug_infinite_ammo 0/1/2 = 0 means normal, 1 means infinite ammo but you still need to reload, 2 means no need to reload.
impulse 101 = Items & Weapons
give item_w_ = Weapon select scroll up/down to pick weapon
give item_g_ = Item select scroll up/down to pick item
give item_m_ = Money item select scroll up/down to pick item
give item_a_ = Clothing select scroll up/down to pick clothing
give item_p_ = Artifact select scroll up/down to pick artifact
notarget = Enemies don't target you
noclip = No clipping mode
freecasting = No blood loss using disciplines
quit = Quit