It's odd to me that Blizzard has been building up the Light/Void conflict for awhile, but hasn't seeded any Void characters or groups on the Horde
Alliance has lightforged and lots of normal light worshipping folks, plus void elves (and to a lesser extent the tidepriests) for its void connection
Horde has Sunwell and a smattering of light influenced groups through other faiths (Sunwalkers, Rezan)
But it lacks any void major characters, and the forgotten shadow cult hasn't gotten anything more than a very cursory mention in legion.
What's up with that?