User blog comment:Phoebus18/Who's strongest Dark Mage?/@comment-5840892-20131215011958/@comment-5840892-20131215055835

I still say Zeref could at least make Voldemort his bitch. Sauron would be tougher, as he is a lot stronger, so the jury's still out there..... I'm basing this on (to a degree) the fact needed either Horcruxes, or a Magic Ring (that we know of) to obtain immortality. (In fact, Horcruxes only made it pesudo-immortality.)

But this also based off the fact that I'm a Zeref Fan-boy; so...yeah....fanboy logic....