I'm working on a website update that coordinates with this map to provide further detail. Problem is there isn't consistency across all maps for how the mobs are deployed. For now, know that green just basically means more than one hunt mob can spawn there.
I suggest changing the marker icons to simple circles, and then by mixing different colors to convey different meanings, you just need to attach different colors corresponding to the meaning in the corners of the map. This would save a lot of time in making icons and explaining to people what they mean.
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