@Procadin
I was thinking about Arakkoa and the original orcish Twilight Hammer clan using the secret powers in Coilfang Reservoir to awake an Old God hibernating bellow the lands of Zangarmarsh and Blade Edge's Mountains. Some Nagas could probably join them... I'll just have to find a good reason. For doubts about Old Gods existing in Draenor here is something Blizzard said:
Taken from http://us.battle.net/wow/en/forum/topic/1008430853Originally Posted by Blizzard Entertainment
@trulte
Yeah, but aren't the fel energies that defiled Shadowmoon Valley's nature a better reason for a "disease" than the Nether? The lava is freaking corrupted and the soil is as dead as Exodar's popularity. It would be more awesome if the Fields of Farahlon were completelly changed and were just getting killed by the demons. Maybe even using the mana forges' last energies to blow the whole zone as an attempt to stop the infinite numbers of demons? :3