Long before the happy clappy or not so it seems world of pandaria, massive evil dragons and dead humans. The Nathrezim were corrupting leaders of Azeroth. Have they finally succeeded with our Trollish rebel to corrupt the masses into total war on Azeroth?
I'll quote WoWwiki (Not a great source)
"Dreadlords prefer to turn their talents to psychic assault and manipulation, seeking to dissolve the bonds that unify individuals, groups, and nations and leave their mortal victims floundering amidst chaos and decay. A nathrezim-occupied world eventually abandons higher morality as irrelevant to the context in which its inhabitants find themselves, joining the dreadlords in their callous worship of the maligned. Although fierce warriors, nathrezim prefer a leadership role, standing behind a wall of ghouls or other allies and retreating when their enemies press too close"
With the latest Spoilers (see http://www.mmo-champion.com/threads/...n-5-3-Spoilers)
Vol'Jin seems to abandon "higher morality" by saying he would let Sylvanna raise dead alliance to fight Garrosh...