Probably my favourite dungeon boss. Super fun to fight, and very fair challenge IMO. Also, as a tip, Call Beyond works _very_ well on him. But yeah, he might have few pretty bs hitboxes, but over-all, I found him to be very fair mechanically. Just stay close to his legs and learn to read when he does the stomp or ground-slam and you're going to be a-okay. And the headless version is, in my opinion, in a way perhaps even a bit easier, since when he does that blood rain move, it's very easy to dodge under him, which will make all the projectiles miss you and get you like 6 free hits. And he does that move fairly often, especially if you bait him to do it by going bit farther away. Oh, and another tip: don't try to get away to heal, just dodge an attack as you normally would and use the attack window as a healing opportunity. You don't want him to do any of the mid-to-long range moves such as the punch or hand sweep.