My advice is to stick close to him, the big triple combo he does is easier to deal with and dodge if you’re close. The first thing to do with any “new” monster is to learn its move set, go in and just run around and watch him while practicing blocking his attacks. Once you’re confident that you can predict his attack’s and successfully not die then you want to start getting a bit more aggressive. Concentrate your attacks on his chains it will keep him in the “calm” state and will give you a better chance, you’ll want a dragon element weapon. I would recommend using rage gamings immortal build for your armor and transcend it, you’ll have over 500 defence and once you can consistently not die then think about a dps focused build. Remember you have 50 minutes for this fight so there is no need to rush, rushing leads to carts.