A sub-race of the Undead Faction.
These creatures are extremely cunning, and one of the few races that are always either lawfully evil, or chaotic evil.
If you are confused or not completely sure of what I refer to, then please check out this site, for mor detailing information.: http://www.wowwiki.com/Chaotic_evil#Chaotic_evil .
You can thereby not trust these foul creatures, even though you are related, or they have sworn their loyalty to you.
They are very intelligent, and not to forget fast, and because of that their main attributes will always be Agility or Intelligence.
They are powerful with magic, and they have cruelsome skills like Draining Touch, Bat Swarm (similar to the Bug-one from Warcraft), and I really haven't thought of any other skills that they must have as race-abilities.
As another skill, though, they should all be able to transform into a bat. I suggest that this skill should work similar to The Prophet's skill, of where he turns into a hawk.
The Vampires are either in an alliance with the Undeads, or Neutral Hostiles.