Is there lore explaining why Ghosts can't revive guardians without help in boss fight areas? I have theories, but I'm wondering if there is some solid lore.
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I figured that the darkness has a hold over those areas and limits our ghosts access to the light. The presence of another living guardian would provide our ghosts with a source of light to revive us with. We get revived more quickly when the guardian directly gives our ghost light for the purpose of reviving us.