Tip from me, take out the other 2 bosses close by, Guangzhi and Lingxuzi and go back to him after crafting armour if you have resources. You’ll also have Guangzhi’s Red Tide transformation spell. I was really struggling with this guy and absolutely steam rolled him after doing this.
I already beat the boss, but this video is super helpful. It would be great if you turned it into a series, because different players struggle with different bosses.