I think that the Glimmer is the smoke that's always present in the pictures. They're called Glimmer because when you look into the smoke you see a small, twinkling, GLIMMER of light. The light draws in its prey until your feeble mind succumbs to the invasive cloud. And that's the light that the Cabal and Fallen emit in the concept art. When someone inhales the smoke, it fills their body and then their brain is overtaken by the GLIMMER of light.
The Glimmer can also take the form of humans and other species and that's how they annihilate races so quickly. They slowly SEEP themselves into society as regular people until they receive their orders and strike.Why do you think we don't know what hit us, what tried to stamp us out? Because it came from within. The Glimmer didn't even have to make most of their own bodies, they put themselves in cigarettes. We invaded ourselves. Soon they had a human army beyond numbering PLUS their other soldiers in space and orbit. We didn't understand what we were fighting because it was US.
English
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Take your idea and think----- hive. Replace all the words glimmer with hive
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That was so dramatic it just calls for a intense moment of "Dun...dun...DUUUUNN!!!!" music