K this is the best and easiest way I beat it and it should work for anyone else too First off make sure that there is only one blademaster then have the rest good gunners Earth eater and gold valkrie work really good. next make sure that you have LGBB+ and have three LGBB and monster broth to make LGBB+ now do what MH did bring ammo if your the sword man. and bring sm bone husks and wyvren claws. (clust LV 2) last the blade master should have either Eternal strife (SNS) 112 atk 630 dragon attribute srr bout long post. bring Mega Demon Drugs. and Demon Flutes. that is the best info i can give you and you should do it I did it with three people two gunners one blademaster in about 5 mins to go.
Yeah but I did it with My Eternal Shisms and my bro had some 4* Elder Quest Gun, Rock Eater