its hard as hell. what class are you playing as?
as gunslinger, just spam explosive retreat and barrage and you should be good.
if you aren't gunslinger, i have no clue.
Thank you: naturally, right after I posted this, I figured it out. I actually play as the Vindicator: the big lionesque guy, and in his case, you have to hit the goblin's rocket packs with your sword until they start to smoke, then lure the dinosaur to them and wait for them to explode. While the dino is down, whack it with your sword repeatedly until it gets back up. Sadly, this has to be repeated several times before--he?--goes down for the count. I tired everything, even Youtube, which has an explanation which is unfortunately in German. All you really have to do is read the text that pops up at the bottom of the screen: hard to do while avoiding being killed, but there it is. Maybe everybody should post here for their individual characters just how to defeat this "boss" or that, as there is very little information available about this game.