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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Bungie has stated a lot of stuff involving the traveller and the darkness. A lot of will be consequences of choices we make or how we perform for special events and stuff. Also we haven't truly seen the darkness, it plays in background a lot, but I think it has it's own "pure" troops.