aight so im pretty sure this is blizzards big secret twist for sylvanas in bfa
we have a planet thats dying here. its pretty bad news as we all know but the interesting new information we gained when this arc started is that azeroth itself is a living being and it can die
so if a titan world soul can die can it also be raised as an undead?
yes it can probably. you and i both know rules for the wow universe are made as and when the writers feel like it. and this is exactly the kind of huge cool sounding bullshit that blizzard would employ as a twist.
if the planet is already dying then sylvanas knows she's halfway there. that's why when she looks at the azerite shes like "this is gonna change everything". its not because she knows it can be used as an ultimately disappointing generic power source with no special effects that weren't already easily obtainable through gunpowder. it's because she realizes the planet is bleeding out and if it dies she can raise it into undeath.
then she goes straight to teldrassil, a world tree thats tied to the planet's life force or something. burns it down, increases the planets wounds. if she killed malfurion and tyrande in the process thats basically the only two non-magni leaders who give a fuck about saving azeroth because you know baine isn't ever going to be moved to do shit.
why raise azeroth into undeath? well idk if you remember but the forsaken are pretty sad about being the outcast undead. but on an undead planet suddenly they're the ones who fit in and the living will get a taste of what its like for them.
more seriously the void can't corrupt undead apparently. who do we know is coming to corrupt azeroth: the void. if sylvanas is there when they show up to make the planet itself undead then they're basically fucked and azeroth will live in undead peace forever with sylvanas as its forever ruler.
evidence to support this:
sylvanas in one of the short stories has a plan that she knows elune is going to try to step in and fuck her on. what kind of thing is big enough for elune to show up in person to stop. apparently killing all the night elves in teldrassil wasn't big enough. ysera being killed wasn't, but ysera being corrupted was. azeroth being killed and turned undead? you know elune is going to try to put a stop to that shit
sylvanas is being set up as making a war on life: self explanatory
the void knows what sylvanas is up to and goes berserk trying to get alleria to kill her. it probably knows sylvanas is going to raise azeroth as an undead planet that cant be corrupted
we have all kinds of horde players wondering what could make them betray sylvanas and obviously this is the kind of thing thats gonna make you turn on your warchief whoever you are. idk about forsaken though but i doubt blizzard really gives a fuck they will come up with something like having nathanos say shes gone too far or baine will appeal to your nobility and you will have no choice but to accept him as your lord and savior
the fate of azeroth will be shared by all its children boyee