User blog comment:Phoebus18/Who's strongest Dark Mage?/@comment-5840892-20131215011958/@comment-4829046-20131215052740

Hmm....

Defeating Voldemort - destroy hocruxes

Defeating Sauron - Cut his fingers off and then throw the ring in lava

Defeating Zeref - Natsu + plot armour and his scarf + Igneel's backstory

Don't really know how one can rank this.....