Ghost= Holy Ghost
Speaker= Jesus
Traveler= god
Fallen= fallen angels / demons
Guardians of light= Christians that died before the rapture being brought back to wage war on satan and his demons
9 vaults holding a boss enemy (rumor) = 9 princes of hell
Last safe city on earth = new Jerusalem
Tell me what you think
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People will always try to find similarities even when they aren't there. Also a portion of Christianity takes a bulk of stuff from Olympian religion and mythology, I would start there instead and work your way up.