Well the undeads are perfect if they are correct, like for instance the undead are not all evil. And the brain eaters can be the backbone eating the half dead that the main army of skeletons took down. Undeads could be very magic based and no real power magic but lots of revival and creation spells
Also the undeads might even bring fear to players. I mean a good army of undeads should be able to continue onwards forever if played correctly but their armies are normally weak. Also undeads are the most awesome thing possible to use in a game!!! nothing can beat them!!! So if you ever need a tester for it i would HAPPILY volunteer
Undeads are the most awesome creatures on any game possible, tough i dont like the ghost part from lotr. But every other undead is AWESOME!!!