(Unearthedarcana guy?)
He rubs his chin. "But in exchange for power, they give themselves one massive weakness, their little soul box. Once that's gone, they die once and they're gone for good." He tilts his head. "What if I were to also become a wizard? Would that make me even more powerful? I understand your aversion to necromancy. But I'm an expert in necromancy and it's cousins. I could help you study new magics if you wish. I'll be a test subject for any experiments you wish, as I can't die again."