So, if you look at the photo for The Arena, you'll notice the sort of barnacle-like material and greenish shards protruding out of the ground - hive-like material(look at the bottom corners). Could this affirm multiple races we can fight, or is it simply terrain Bungie has put in?
Or might it be that the Prison of Elders have prisoners of all races?
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They did say they were going for variety and replayability with PoE. So maybe we'll get to fight multiple enemy races instead of just Fallen.