Okay so here’s a scenario
Ghaul: *entraps the Light*
Guardian: *gets killed*
Ghost: *does survive but can’t bring them back*
*few weeks pass*
Ghaul: *gets defeated*
Ghost: *gets the Light back*
Could that Ghost go back and revive their Guardian?
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I imagine they're dead and get stuck in a DMV waiting line in purgatory for a ghost to come around again.