There are. Have you noticed how sometimes they are different colour? Read the Grimoire
English
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I was looking at Grimoire cards but i didn't see the different factions like with the Fallen, Vex, and Cabal.
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Not really factions, but some sort of distinction exists between the Hidden Swarm, the Spawn of Crota and the Blood of Oryx
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Thanks for the Info I have noticed that they are sometimes a different color but my theory with that has always been Hive with different color armor have different exposures to light and heat. Because they are like insects their exoskeletons can change color like an insect due tho the amount and type of light that they are exposed to.