Whoever came up with the idea of Succubus > mistress > ?? line is a genius!! The backstab/drain attack is amazing when positioned correctly (which is good because when not backstabbing it's not that good of a move which makes it balanced) and the scream ranged move makes sense as well.
I only saw one post in this thread for a female form of vampire so I'm not sure who implemented them into this faction, but good job.