The first one doesn't happen, Sylv is a traitor for turning on Garrosh, no argument there, though Baine both did that and has now betrayed both of his Warchiefs to an enemy power while they still had widespread support during a total war, but siding with Helya had zero negative consequences for the Horde. The Horde's new ally only functions on the basis of a deal with a death god to whom they sell a million unwilling souls. Even then, this still fails to give Baine any qualities of his own, it just means you can barely, through fanfiction, make him sound about on par with a villainous caricature.
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Xath
Posting here since I got lost in the shuffle of the million Sylvanas threads. I'll look into since it sounds fun, but no, I don't back Sylvanas because she's omnicidal, especially since if she is, she's failing spectacularly at it and even lies about it to herself in her internal monologue. I like Sylvanas because she's the only one alongside Gallywix who's actually advancing the faction war this expansion is supposed to be about and the only character not in thrall to the most insufferably flawless figure the writers have ever produced, i.e Anduin. She's not good, she's a complete caricature in this one, she's simply preferable to everyone being in the same state of vegetative perfection as the Alliance is in this one. I take it you aren't exactly looking forward to the Alliance forgiving the Horde for Brennadam, Teldrassil, the War of Thorns and so forth, just because you booted Sylvanas at the end.
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kasuke06
Previously neutral has no weight. It means not neutral anymore, just like the tauren would know around the time Theramore forces took over half the Barrens and they were forced to build a big wall to prevent an Alliance invasion. The Great Wall wasn't meant to ward off quillboar you know. As for the moral implications of the mana bomb. That it has any in setting is based purely on real life ideas creeping in that don't match up with what else is common in setting. There's no appreciable moral difference between it and a big regular bomb and in the course of play we routinely do things like suck out people's souls and send them to burn in the fiery pits of hell to summon demons, drive them insane with pure entropic magic or raise them as undead ghouls. Also, Baine didn't know if its existence by the time he committed treason anyway.