Hive = Flood Fallen = Elites Cabal = Hunters/Brutes Vex = Not sure, but similar to Jackals I could go into a deeper analysis as to why they are similar, but It's late. However, I want to say that this isn't a bad thing. The majority of people playing this will be like my brother and myself, long time Halo fans. Honestly, this game WILL be it's own thing and will stand on it's own, but I guarantee that it will have Halo and Marathon references, Halo and Marathon references everywhere. Again, not a bad thing.