get to lvl 100 easy with these on the island, get a decent lvl one (mine was around 185 3.5k health and 370 melee) go into swamp cave and grind it a good couple times, will be even faster with notes! On small tribes I got to lvl 94 doing a note run and doing prob around a quarter of the cave(bc my friend accidentally took off his gas mask while low). be careful though, I would bring mate boosted frogs because athroplueras can kill them kinda easily and you'll have to dump inventory a lot as I got 3k cementing, tons of chitin and meat in my small run