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Can't say for sure, but seeing as most of the setting shown in concept art appears to be forerunner, perhaps some form of rampant machinery. I think it'd be kind of cool if it's the forunners except they've been corrupted from millenia trapped in survival exoplanets and they look more humanoid than the covenant species and you have to fight and help them become their former gloryThis has been spammed. Read other comments and find out.

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