I mean they have a standing army more than a million strong. Each member of that army can wade into battle outnumbered 100:1 and still win. Not only that but they are IMMORTAL. Killing a guardian only pisses them off.
No worries your city is protected by millions of immortal juggernauts. With magical powers to boot.
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#Destiny
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You are mixing the story line with the game mechanics the story is that there a few of you and on the moon *spoilers* you find a dead guardian who cannot be revived.