This boss is fairly easy. Make sure you have enough of each healing potions (20 if you can, thatâ€™s the max you can hold) and stay underneath him or as close to him as you can that way he wont be able to hit you with his most powerful attacks. When he goes up into the air move around that way you have a less chance of getting hit. If anyone dies during the battle donâ€™t worry because after a while they will come back to life and join the fight again. After a while the battle will end awarding you the achievement.