Here are ny thoughts:
Exos are inspired by the Vex. Both with souls of their own species.
Awoken are souls. Just souls.
Cabal were ancient enemies of the Vex. Cabal obliterated them turning them into a soul-driven mech species.
The Fallen were slapped around by those slenderman looking things.
Hive=space zombies
English
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Even tho the hive are a race
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I like the idea of the Fallen coming back for revenge on the darkness.