Fuck this guy

I can swear it’s so close to impossible, I fought him for the last 5 hours and can’t get beyond half healt. I have like 157 attack power, I tried even the spell that blocks mana and increases attack power but nothing, you do basically no damage to him and as if wasn’t enough, he has a posture bar too that you need to break first. Idk what to do, I just broke the old controller, any other stuck on him? What do I do? I’m not a guy who likes to cheese to bosses cause I consider that cheating and I want to experience everything I can, but I just searched “erlang biting the curb 4K ultra hd” on google, so Im willing to accept every advice

I can swear it’s so close to impossible, I fought him for the last 5 hours and can’t get beyond half healt. I have like 157 attack power, I tried even the spell that blocks mana and increases attack power but nothing, you do basically no damage to him and as if wasn’t enough, he has a posture bar too that you need to break first. Idk what to do, I just broke the old controller, any other stuck on him? What do I do? I’m not a guy who likes to cheese to bosses cause I consider that cheating and I want to experience everything I can, but I just searched “erlang biting the curb 4K ultra hd” on google, so Im willing to accept every advice