There is always the theory that darkness doesn’t actually exist. It’s just a lack of light. Maybe the triangle ships are the fifth race. Maybe they are beings that for some reason are just hell bent on extinguishing the light. They could be so powerful, that they were given the moniker “the darkness”. But, like I said, maybe the darkness doesn’t really exist. Just beings (worms, hive, 5th race) who abhor the light.
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There are many theories. There's always the "5th race was chosen by the Darkness and follows it everywhere, even copying its design" There's the "everything is the 5th race" And then there's the "every ship is a vessel for the deep".