Almighty can destroy the sun,and it will kill any Hive,Fallen,Vex in solar system,but not even one of them want to stop the Almighty except a guardian...so i think bungie never thought about it.Because they only thought how to make this mission epic....
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Vex doesn’t care if it kills them, too. They want all races to die, all light to be snuffed out.
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No, they just want to survive. They only kill things that display open hostility towards them.