@Abby Normal The Vamp himself was an insanely dangerous unit. A Vamp Lord is straight up one of the most dangerous things in the entire TT.
Roswita would need the equivalent of multiple God Turns (like we had with the theoretical Bloodthrister fight) to put one down.
Snake Juice Powerstone might effectively be a Qhaysh Powerstone, tho. It's one of the first things I thought that might entice Elfs with.
We'd need someone that can concentrate Qhaysh like we did for Ulgu and test if it expands into more Qhaysh, which is potentially revolutionary as it's my understanding that Qhaysh isn't actually stable by itself.