I don't think there's anything inherently "good" about light, nor is there anything inherently "bad" about darkness. I'm of the opinion that all of it is interactions between different forms of exotic matter. The particles that make up the "light" are probably differentiated by them emitting photons. There's a warlock bond that splits quarks. An armband has more capabilities than the LHC. There's really no way that could happen beyond weird interactions between exotic matter. If you can shrink the LHC down to an armband, and there isn't any fanfare, why not create other synthesizers? Why not implant tiny light synthesizers in people, and use them as weapons? Putting a brain behind the use of exotic matter to eliminate your enemies? Honestly, there's probably less difference between the light and the darkness than anyone realized. Sunbreakers (the class) are created when a Titan messes around with the Forge, a particular Vex construct on Mercury. Why are the Vex experimenting with altering light? More importantly, why are the Vex minds able to be used and comprehended by humans (well, technically, human simulations, but perfectly accurate human simulations)? Are they actually a futuristic human creation? (There's a lot more I could say about that. No time to explain.) But, getting all the way back to the topic, its very possible that there are Bible analogs. Most English fiction has at least one of three intellectual ancestors: The Bible, Shakespeare, or the Iliad/Odyssey.