Originally Posted by
Aonea
Sylvanas is stuck in a situation with no good ending. She fought the good fight against Arthas, only to have him raise her up as a Banshee purely as a dick move because he was butthurt she slowed him down.
She then spends the time from then until WotLK plotting her revenge on Arthas and trying to keep the Forsaken together. She finally get her vengance and suicides realizing she has nothing left to live for only to discover that there's no peace after death for any undead like her. They get to spend the rest of eternity wandering the Shadowlands; no peaceful rest, no drawn into the Light, just fuck you for having the misfortune of being revived as a zombie by a manchild with a frightening lack of common sense. The only thing that saves her is the valkyr make their pact to serve her in exchange from freedom from Northrend. Now she can at least revive her people, but her valkyr numbers are limited and they have to die to revive her.
So, right after she deals with this little shock to her system, Deathwing pops back up and the wall to Gilneas breaks open. Garrosh then figuratively and damn near literally holds a gun to head and forces her to throw her troops at Genn's forces, who are more than happy to employ guerilla warfare to bleed her troops; troops which she now knows are damned if they die. So she breaks out the plague, because she doesn't want to lose more of her people fighting a battle she really didn't want in the first place, only to get shit on for doing so.
So, she manages to survive Garrosh's stupidity and seems to be at least neutral with Voljin. Then the Legion invades and shit goes all to hell again. Now, while she always talked big about wanting the power of the Warchief, she now finds herself stuck with not just that, but all the responsibility that goes with it. Because she needs the Horde, the Forsaken cannot stand alone, no matter how badly she may want to. In Stormhiem she finds out about the possibility of getting more valkyr. Boom, problems solved; with those, she can keep her people alive, its all good. Till Genn comes in with his "MUH SON" and fucks all that up.
So now, while the Legion is gone, we are stuck back where we started before. Both the Horde and Alliance are still pissed at each other, with fresh fuel on the fire due to the first assault on the Broken Shore. So, when the Azerite starts appearing what is she going to do?
Well, she is going to make a grab for it. It represents a shift in the power balance and at this point she has nothing left but to keep fighting for survival. She has no other option and given that she is a pragmatic, if not outright ruthless and cunning general the best play is make the first move. She isn't naive enough to believe the Alliance would leave the Horde alone, especially not given the mood Jaina and Genn are in. No matter how much they may respect Anduin, if push comes to shove, I think he will find out that some of the Alliance may not put up with his shit nor will they ever forgive the Horde. And thus the cycle continues....