I recommend the Bone Ash Armor since it has good fire defense. (You unlock this armor for beating this boss in a lower difficulty dungeon and can buy it from insight messengers)
I'm using the Blades of Mercy (Level 10) for obvious reasons. I didn't have a Bolt blood gem for this weapon, but if you do, I highly recommend it since this boss is sensitive to bolt attacks.
The timing takes a little bit to grasp, but I beat him on the 3rd attempt.
![](https://i.ytimg.com/vi/UpIj8Z3g498/maxresdefault.jpg)