User blog comment:UPL2229/Tassadar in Legacy of the Void/@comment-3581786-20190125195613/@comment-250398-20190128051310

That's a large twist of the established Khala even if that is the case, there's nothing to indicate what exists in the Khala is more than memories, and adding Void to it shouldn't make it more stable. While the Twilight Messiah mythology was there, the idea was one would come who was the "reincarnation" of that aspect, first being Adun, second being Tassadar, and third presumably being Artanis (though all Zeratul says is he believes there would be a third).

But even if that weren't the case, making Tassadar come back to life is just a poor choice narratively. The fact he gave everything for his world means less if he can still live on and chill with his old friends, even if it's a spirit. It devalues the meaning of what he did to stop the Overmind, and resurrection in any medium just lowers the stakes of any encounter so much. I thought it was a bad idea when they did it for Stukov, though the angle they did it for Talandar I at least thought was interesting.