Man... the thing Horde fanboys and fangirls will do mental gymnastics over... it will never cease to amaze me.
I was initially going to say Blackhand, the problem there is that his Horde was pretty explicitly Legion-aligned, whereas the Alliance isn't Void Lord-aligned.
With regard to the shift to Death Magic in Doomhammer's Horde, I'd argue not really. The Death Knights were undead Death Knights, of course, but they were just Shadow Council Acolytes in human corpses. Their powers, much like those of even the WCI-era Necrolytes, seem to be derived from Fel rather than Death Magic.
With regard to leashes, Umbric certainly isn't on one; however, neither were the Dragonmaw and their merry band of Warlocks (something that really burned Gul'dan). I don't really recall the Death Knights being on one either. In fact, the leash seemed reserved for Gul'dan and those near him.
The fuck? Suddenly everyone can raise the dead. Bullshit...
Seems like they're just using the void to animate them rather than "raise" them, like creepy marionette puppets.
Really want a void raptor mount!
BASIC CAMPFIRE for WARCHIEF UK Prime Minister!
That's basically the whole reason the blood elves exiled the void elves, isn't it? The last elf to tamper with the void went totally bananas and arguably let the Scourge into Quel'thalas to kill them all. The blood elves are pretty convinced messing around with the void never ends well and falling to madness is only a matter of time.
It's always incredibly amusing when people accuse the Alliance of committing war crimes by doing the same shit that Horde always does (and many more times).
Horde kills Alliance (and Horde) and raises them, several times. Dead silence.
Alliance kills and raises some animals in a land that the Horde wants to take. WAR CRIMES!
Yak. Yak never changes.