Euthanatos

Death is a cycle, and when people are too toxic, it's these guys job to remove them from it. The Euthanatos have what they do in their name: they believe heavily in reincarnation, that life is a big cycle that people jump on and off of all the time. When someone or something dark or evil is around, then they begin to poison and despoil the people around them. And thus, they Euthanatos dispatch them. They're masters of life and death, with their recruits coming from people close to death such as medical professionals or priests.