Can the Darkin only possess humans?
This is a fairly straight-forward question, I think. We know that the Darkin are trapped in their own weapons and have to rely on mortal hosts, but does that explicitly mean that the host has to be human? Could a vastayan be possessed by a Darkin if they touched the weapon? What about the Ascended? What about Yordles? Do other races aside from humans have some kind of immunity?
Just a thought that's been on my mind lately.