They aren't. It's one of the principle rules of magic. You cannot travel long distances, your body cannot physically enter the Fade, and the spirit cannot be returned to flesh after it has fled. A talented healer can bring you back from the very precipice, but beyond that is nothing but a spirit playacting. "Necromancy" has nothing truly to do with the dead beyond toying with corpses.
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You'll need to get used to it. There's no going back.
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