This is really cool! There is wolves on Mars!! If you frenzy them they spawn a mysterious Archon Priest!
Currently killing them doesn't net Grimoire or Rewards, but we can assume that will change on Tuesday!
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No quest just part of 2.0 saying after a ttk quest Petra can give us wolves bounties. I guess this boss on Mars is one of them or part of a Mars strike or story for taken king