Big ole fat Adult Varkid...how the thing managed to fly is beyond me. Found him on the farm with my second Mechro. So happy. :))) --- I think God is really a 12 year old and we're just his science fair project.
Gratz. I found mine in the Caustic Caverns rummaging in a dumpster. I totally didn't expect to run into one at the time, so it was a pleasant surprise. And it even dropped a pretty neat legendary launcher, although it was only level 27 but yeah, still cool stuff.