Just a curious thought, what kind of death curse do you think he'd use? I think as a medicine man, and expert in mortal medicine that his death curse could take the form of some kind of virus or illness. For example if he wanted to take out a bunch of White Court vampires, his curse would infect them, causing all kinds of horrible symptoms, and ultimately killing them.
On the other hand he could go in the opposite direction and his death curse would actually be a life saving time spell where he dumped everything he has into healing, or saving people who are in trouble.
What say you?