The Vampire perk is a perk in All-Star Versus 6: The Nightmare's Reawakening. The good effects make this an incredibly useful perk...however, the negative effects make this one of the worst perks in the game.
Good Effects: Upon hit, grants you 1/2 of HP of the same damage you did (ex. do 20 damage you get 10 HP in return)
Bad Effects: Weakens overall damage by 20%, no critical hits.