I love the day night cycle , but it think Bungee missed a trick with the night time.
Imagine the sense of foreboding as you see the sun setting, knowing that the higher level Hive masters are going to be out in numbers, and that the darkness will cover the land making visibility limited without your ghost light.
Will you survive the night or succumb to the darkness....
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I think this would be great like make fallen eyes glow off in the distance, or have thunderstorms at night. Ambush attacks by hive or fallen! That would be awesome.