To clarify slightly, at least as I've understood it: Light: complexity, proliferation, expansion, growth. Dark: simplicity, perfection, reduction, survival through negative selection. These forces are those that exist in our world and everywhere. Think of a slime mold growing across a log in the forest. The proliferation of cells and of increasing complexity of pathways it might follow through the wood is an aspect of the light. Not noble, righteous or "good." Just is what it is. The same being. Now it finds itself growing into a richer part of the wood. The parts of the mold growing away from the richer wood are cut off and allowed to whither to better serve to organism as a whole. Not cowardly, weak, or "evil." Just the way of things. Now counterpoint: think of a cancerous tumor. The rapid mutation, increasing complexity, and diversification of cell lines would be aspects of the light. The doctor cutting out a part of the patient so the whole being can survive, winnowing of the cancerous growth, are aspects of the dark. The forces themselves are not so much opposed but are part of each other and come together to form a whole, balanced universe. The Traveler and the Witness, as far as we know, are not necessarily wholly representative of the light and dark, but beings who tend toward the most extreme edges of the universal philosophies they represent. They are beings with agendas and desires. We've used the light for what we think of as good, but we can't forget that there have been lightbarers that committed acts of evil. Think of the tales of risen warlords and their brutality toward each other and the lightless they saw as prey. The hive use their darkness for unspeakable acts of evil, but we must remember they have emotions such as love and others we might call good. Oryx, the Taken King, came at us not as a conqueror, but as a father who bore the grief of loosing his son. The light and dark are simple, natural, and passionless aspects of reality. That said, when it comes to the beings that live within that dichotomy, there is much room for evil and good.

Darkness gave Calus bobbleheads Light doesn’t give bobbleheads

No Light bring death to civilisation cause they arrive and fall Back when it gets Spicy dark is not evil its the opposit of Light so in that case Who is bad and Who if good does mean anything. We also dont Know what happen in the complet timeline of the univers. The onlyone you can call evil here is the witness but he s not the darkness he Just use the power of the pyramide

But what is “good” and what is “evil”? More importantly, what are the Light and the Dark? Are they their own beings, with individual intent? Are they just forces without any will of their own, much like convection from a stove top or the constant pull of gravity? I’m not going to try and change your mind, because the idea of them being good, evil, or neutral is inherently a dumb question based on our own morals as a bunch of evolved monkeys who decided that we own this space rock. Also because it’s a video game, and I truly could not care less

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The Light ≠ Good or Bad The Darkness ≠ Good or Bad It’s all depends on the wielder. Void, Arc, Solar, and Stasis are simply tools.

they're forces of nature the both of them, they don't have any will

How do you rationalize the traveler giving savathun the light then?

The darkness is a power. How you use it is up to you.

I would direct you to the flavor text from the Prophecy Dungeon Daito armor, the Hunter set in particular.