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I can give you along explanation about this. lol im sorta obsessed with halo. but ill spare you and give you a short one.

The Halo's were built to destroy the Flood. These things called the forunners created the halos as a last resort. what the halos do is kill all life across the universe for billions of miles, so it makes the flood starve to death.

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12y ago

What else can I help you with?