Here are the rules of mortality as written in Warcraft:
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There are basically two types of beings: Mortals and Magic Creatures.
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Magic Creatures have a home realm. When they die outside that realm, they return to their home realm and respawn. When they die inside their home realm, they cease to exist.
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As for Mortals, when they die they go to the Shadowlands. If they die in the Shadowlands, they cease to exist.
Now, if we pay attention, we see that Mortals have the exact same death behavior as Magic Creatures from the Shadowlands.
In fact, as we’ve seen in Shadowlands, Mortal souls just become Magic Creatures associated with the realm of Death when they die.
So for all practical intents and purposes, Mortals are simply the larval stage of Shadowlands creatures.