It seems all we are fighting is humanoids. The Cabal, Fallen, Vex, and even the Hive are humanoid. Heck even the Covenant except save the Engineers were pretty much Humanoid.
Where's all the multiple limb crawling or floating horrors that know how to use weapons at in this Scifi/Fantasy opus?
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They are probably just the super intelligent species that we are fighting. I'm sure it will be like skyrim where there is lots of hostile wildlife hanging out on the planets as well