That I might want to make a closed species. But I would want it to be supernatural and horror (since that's what I love).
I do have a general idea of what it can be:
Basically masks. Like, there can be a vampire mask (with slight mutation) and when a user wears that mask (which is hard to take off without maiming) they are transformed/mutated to a vampire (or desired design). That's basically the concept. The only thing I'm having trouble is coming up with a name. Of course, this is just a concept.
I might do this. :3