Hey dude my PSN tag is Hamo-on-roids if u want to do the EE add me and I'll help you. My Gobblegum setup Perkaholic (if u have if not replace with) Unquenchable and on the house, Firesale, ammo , deadman walking and the most important for boss fight only HEAD DRAMA Gobblegum, why? Because a brecci or haymaker with blast furnace will not only fill you ragnarok metre super fast panzers don't stand a chance plus monkeys also plays a big part when u place ragnaroks in the middle throw monkey bomb to distract skeleton zombies then use bow charged shots to take out keeper. It took me a while to find this strategy and to make it work also from the start of boss fight till he's dead keep running and don't stop if for some reason u have to and should only be when shooting keeper when he reveals hole in chest THROW A MONKEY BOMB otherwise you'll get cornered and then it's game over. Hope this helps u like it's helped me add me on ps4 if you need help. 👊🏾😊