deathknights sometimes remove and replace their limbs with better ones. some orcs have demon hands because they liked the claws. some bloodelfs have wings they ripped off a harpy or a demon. some deathknights just straight up add arms. so you can see a really tall troll frost dk coming at you with 6 arms wielding 6 diffrant weapons. all they need is a bodypart and some rune magic. maybe a dk needs to be faster? they replace their legs. more strength? bigger arms. etc.