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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If the guardian died its more then likely the ghost died as well. Gotta remember that ghosts were badly damaged after that happened. Unlike a guardian they cant defend themselves. Its not a matter of what if, considering its a safe bet that if the guardian died the ghost died. But in that non-existent scenario its safe to say that a ghost can revive its guardian as long as it has light.