According to the voice dialogue It appears that the rulers of Azeroth are content with leaving Sylvanas' fate Sylvanas up to Tyrande, the leader of the Night Elves. Sylvanas has, after all did commit genocide in the face of the Night Elves by burning down their home, Teldrassil, and started an all-out war against the Alliance that was the main reason for Game of Thrones' Battle for Azeroth expansion. The execution of death at Sylvanas at his command was to deliver more souls to the Jailer and in his schemes. With all this in mind, Tyrande is perhaps the most suitable person to carry justice for what Sylvanas did.
Tyrande observes that, while Sylvanas is now showing regret for the actions she took (thanks to a complicated story involving her getting part from her own soul) However, there is not be peace with the Banshee Queen given all the wrongs she has committed. Instead of a gentle death or a prolonged execution, Tyrande appears have an alternative plan for Sylvanas.
"Below lies an Maw," Tyrande tells Sylvanas. "Every soul lost in the depths of its abyss, abandoned or condemned, you need to find and send forth to the Arbiter. You'll work there under Dori'thur's watchful eye. This is how you can bring renewal to your victims." , saying "My actions were all mine and I accept their consequences" and she does not want mercy. After several years and being identified as the game's principal enemies and committing a series of horrific actions that were almost responsible for the demise of all in Azeroth, Sylvanas will be condemned to wander the darkness of the Maw in searching for all the lost souls she left to the Maw.
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