A vampire, ghoul, and revenant are different things. :) Revenants are something like zombies, undead that eat the flesh of the dead and dig up graves; they don't exist in Heroes. In Heroes 3, the undead have ghouls, which is correct. A ghoul is a dead mage who can transform into a bat and any other animal; they are ugly and reek. In the fifth Heroes game, vampires are absolutely correct; that's how they should be, like Dracula. Added after 3 minutes: Vampires and ghouls are completely different things in the third Heroes game; ghouls are dead mages who can transform into any creature of God. And vampires are correct in the fifth Heroes game.