Mind control is something some trolls can do with psychic powers. Vriska, out of who I know, though Tavros can do the same thing with animals. I don't know about torture spells, nor do I want to. But killing...

[He seems to sink into himself, eyes squeezing shut tight as he remembers the bright surge of white light...]

[A shudder runs down his spine. Pulling his legs up onto the bed, he hugs his arms around them.]

I'm glad you're better than that.