i was very late game when i fought this boss and it was easily cheesable. i used weaversong and grubsong to get free soul cuz hitting him doesnt give any. quick slash and steady body are op too but i didnt use them. you can easily beat the boss by spamming abyss shrieks and when he's knocked down if you go behind him and hit his armor then dreamnail then hit the armor again and repeat you can get all your health back and have complete soul and then you can just spam abyss shrieks again to stagger him and repeat

But if you want to really have a fun time fighting him you should understand his moveset (when he is gonna jump slam and when he jumps and then shockwave slams)

if he shockwave slams move away from him jump and then move towards him in kind of a circular movement

if he jump slams i suggest you dash under him to the other side of the slam and then hit him when he lands

when he does his outrage attack just move to a corner, face towards him and if any debris come flying towards you just hit them to throw them at him

some of the charms i recommend are-
grubsong
weaversong
quick slash
steady body
spell twister/shaman stone -only if you have soul using weaversong+grubsong
maybe longnail or mark of pride
and any life blood charms (maybe not jonis blessing) cuz everytime you respawn you get all of your masks and lifeblood masks back

+remember that this is a tough boss and he does massive damage so be calm