To list it off; - Constant AoE environmental hazards; Check - Enemies that constantly apply debuffs or force player movement (Stasis and Strand Dread Psions, respectively); Check - Enemy spawns that are as slow as molasses, during a timed Ops; Check - Invulnerable enemies with buggy vulnerability mechanics; Check - Limited revives that go away after a time because the last 2 points combined are almost impossible to work around; Check, Check, and Check. Overall, this Call to Arms challenge is not worth the effort so far, because at this point, you know that Bungie is just Trolling us. Why else would they make Dread Salt Mines a definitive part of the event?