purple guns, and Borg arms, which are usually just versions of the minigun. With a halfway decent team, the temple, powerplant, and probe ones were all pretty quick/easy. City hard one has been bugged/unbeatable most of the times I've tried it.
Need to see if I can do the event and just run city easy missions for a while, to get enough gear for the remodulator. seems that's the best drop for the data samples needed, lots of spam killing, so lots of chances.
they just run it so rarely that i've only gotten the chance to play Defera twice.