Greyheart Nether-Mage is a mob in the Serpentshrine Cavern raid instance. Nether-Mages can occur in any of three flavors- fire, frost, or arcane. The flavor of mage may be determined by looking at their self-buff; each uses a damage buff of its particular school, as well as two different AOEs of that school. For example a fire mage has a self-cast buff that grants +350 fire spell power. These buffs may be stolen to boost your mages' damage and reduce the damage dealt by the mob. Furthermore, all Nether-Mages can use Blink to move to a random player, although it does not appear to be an aggro drop. They are vulnerable to sheeping and fear. They are immune to Hammer of Justice and Curse of Tongues.