Chaos = more enemy spawns, more random events, harder patrol missions, just more chaos (ex. Alters of Sorrow event on the moon).
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I would love an event in patrols that grants players a guaranteed exotic after completion. Bungie can boost the difficulty to whatever they feel is right and think about it, 10-16 players in one spot killing aliens left and right and everyone working together to take them down sounds like a lot of fun.