I was just walking along a path in the Wastelands and there was a Marlix flying around in some jungle trees. I'd hit it and it would spawn some "enraged guardians" and I'd kill the guardians and move along the path further to find the Marlix again. Once it got out over open water it stopped moving further so I could actually kill it. It didn't take as many hits to kill as I thought it would and because it was in water the guardians (enraged skeles) weren't very effective.I got about 3k tokens, 3 fragments, 3 skele heads, and a bunch of shiny arrows. It was quite fun to fight and that was literally the first time I had ever seen a Marlix out in the wild before.