Vampires (okay bear with me now)

[Dogwood]

much of the disease mechanics will be something witches can do.

Yeah I kinda see vampires as an extension of witchcraft, seeing they were sort of a manifestation of the same fears, the difference I see is a matter of willingfullness, witches choose to be so (in other words learning the skills) where as the vampire the motives are much more ambiguous, hence only being awarded the abilities right without needing to learn them, but only after a gruesome death. One of those two sides of the same coin type deal.

Keep the after death idea and tweak is my thought.

Umm maybe after being murderered there'd be a small probability of coming back as a monster with crazy stats and a time limit who could only be seen by and interact with one thing in the game, his killer. Something like the Tell-Tale Heart on steroids. I really don't know.

[Plazek]

Why should you only get this advantage of being allowed to live on if you are the attacker.
Seems kinda unfair don't you think.

I would imagine the most fun things to result from something like this would be someone being killed and then getting revenge on his killer since he somehow became a vampire.

I think the method you have for becoming a vampire is boring though. It makes no sense for everyone to just have a random chance of it having.

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Anyway I would rather see skin-walkers.

http://en.wikipedia.org/wiki/Skin-walker