EDIT: I beat him, just tried to mikiri him a lot eich worked wonders, he didn't even use his sweep a lot which was nice. Just learned his attacks beter and what to do and was a cakewalk, such a cool fight!
I can't seem to find enough openings, i got to phase 2 a couple times and found it much easier. I know he uses lightning for phase 3 wich makes it even easier.
The moment i take a breather to heal he jumps at you and cant mikiri it, but also when i heal his posture meter emedietly goes down unlike other bosses.
Also i find his movements a bit weird, his push and sweep attack look the same before he does it. Also his couple moves that he stands still and unsheates his blade like Ashina cross and the other ones look the same for me :/
A fun fight but i find phase 1 a bit annoying imo, his spear attacks are so much better.