Netherguard

The Netherguard are a group of void ethereals led by Nether-Prince Durzaan. They attacked Umbric and his blood elf followers in Telogrus Rift.

Named

 * Nether-Prince Durzaan

Unnamed

 * Netherguard Adept
 * Netherguard Phaseblade
 * Netherguard Transmogrifier

Speculation
Shadreen may be a former member of the Netherguard.