I've played gambit prime pretty much since its release and the only boss I can never complete is the hydra, every other boss is easy enough but the hydra boss we always time out with the tiniest bit of health left.
Just wondering if anyone else had this same problem, I'm not sure why I find it so difficult
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Only fought them once, with 3 randoms, and I agree they're brutal. We managed to kill them with just a couple of seconds left, though, which was satisfying. I think this one takes a lot more coordination than the meatball or Cabal boss we get in there.