in my last game I had, for the first time, a few vampires in my army of darkness, and I found them to be very powerful. It seems they can not be hurt by physical damage, so this basically lead to one vampire wiping out half of the desperate final attack all by himself. Together with a few poison traps, that is… but nonetheless, none of the other minions could have done that, and it seems that if I have enough vampires, I would be basically unbeatable. I feel they are too powerful.