Y'all notice his soul split in two?pic.twitter.com/h1njcno5oO
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Furthermore, she had her soul returned to her body— if what they say is true that “relentless spirits” from Maldraxxus make the bulk of the scourge forces, I can only imagine that that’s where Sylvanas was destined to end up.
She would've likely ended up there after Wrath but because of her actions after returning, I'd say it's a trip to Revendreth or the Maw depending on whether she's redeemable.