So, how come some guardians have died permanently while we get revived over and over? My theory is that the ghosts revive us using light the traveller is collecting while trying to heal itself. So, when we die at a slow rate, 1 or 2 here and there it is able to keep up, but during large battles like six fronts, twilight gap, and the assault on the moon, where guardians are dying in droves it cannot keep up. Maybe if your not revived soon enough you die permantly.
This does not account for the original raid parties of vog and crota. The vog party was erased from time. My theory doesnt account for why eris's raid team could not be revived. Maybe their were extenuating circumstances? What do you think?
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We use the Light inside our Ghosts to be revived. For example, if we are in a Darkness zone out Ghosts can't muster enough Light to revive us (so Bungie just has us restart at the last checkpoint as if it never happened). So if a Guardian's Ghost dies or is separated from them, they cannot be revived. Very simple