I've noticed a lot of similarities between the games. If you've noticed anything else comment and I'll add it!
Dregs=Grunts (I know they look different but Dregs occasionally make the hilarious sounds we love from the Grunts)
Arc Blade=Energy Sword
Vandals/Captains=Elites
Psions=Jackals
Titans=Spartans
Cabal=Hunters
Shanks=Engineers
Sword of Crota=Gravity Hammer (bit of a stretch but think about the different attacks)
Bladedancer Invisibility upgrades=Active Camo
Vex=Prometheians
I'm not making fun of Bungie for reusing ideas- I think its cool!
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fallen = covenant hive = flood cabal = brutes vex = prometheans