The only way for a ghost to die is for it to be deprecated from the Gaurdian and the only time a ghost has died has been when the guardian was separated by time from the ghost or the ghost was captured and as long as the Gaurdians live a ghost ain't getting captures
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Not true, in the grimoire it states that during the reef wars awoken ships fired on a fallen force dug into a trench as a team of nine guardians rushed the fallen. The guardians and their ghosts all died instantly and the city cut off contact with the reef for their actions