Honestly much easier than I thought. Just make a trap, mine was on a raft, I suggest stone as they can’t break that. Get a flyer, but if not, just make sure to pump your speed. Find a Rex, life it up the ramp into the trap and shoot it. Mine took around 30 tranq arrows for a lvl 3 but idrc it’s low. It’s out and the torpor drops at an alright pace but bring narcs anyway. Hope this helps :)