So this ended up being the hardest fight in Dark Souls 2 for my Faith based Paladin style build. At least so far. I saw a lot of videos for how Sorcery and Melee builds can do the boss, but didn't see much about Faith builds killing him. So I sort of pulled pieces out of both melee & sorcery guides and sort of blended them together. Key for me seemed to be circling to the right once you're behind him.