Appearance/discussion of Necropolis units.

Or maybe they could have made several types of attacks – some that can be broken through with teeth (gremlins, furies...), and others with a sword (gargoyles, titans). As for drinking blood, it's easier to break through thick skin/armor with a sword, and then use teeth.
But, come to think of it, how did vampires bite gargoyles before?
It was a shame they removed the transformation into a bat – it was elegant, and it justified the name. Now vampires are wingless:(