The Darkness is not a faction. It's a generic term for anything that isn't the protagonist faction of Destiny. Bungie's writers sure are creative nowadays.
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[i]* Loads TX-130 Saber-Tank lazer round*[/i] No, the darkness is an entity actually. Same as how the light is an entity as well. The darkness does not have a physical form but it infuses other races with its power, thus making them part of the darkness.