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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Cause the citizens know only 3 guardians can team up and hit the enemy hiding spots. If you try to out a 4th guy in their it opens a paradox portal. Our minds will be blown.