It's one of the of the species of aliens out to get you, not some rip-off of StarWar's "The Force".

I usually reply to topic in good fun. This will be no exception. Thank you for your consideration. :) To speculate on glimmer being a species in addition to my previous post, I would like to propose that the glimmer is in fact an alien nano species that are possibly parasitic and live within those who choose to accept their "gift" of magic or perhaps they only attach to those with a specific DNA, thus warlocks have magic, etc. I would like to think that the glimmer were ejected from the traveller when it sacrifice itself for humanity like seeds or spores. Not all aliens want to harm us.

They're known to be associated with Onyx Pyramids and whenever they are around their is mysterious glow. We have concept art of a fleet of Onyx colored pyramid shaped ships flying above a planet (Either Saturn or Jupiter, I can't remember which) and another piece that shows a group of both Cabal and the Fallen moving through a jungle with a mysterious glow coming from their bodies. I doubt they're friendly.