Bring the shadow mantle.
Good luck.

i already have it
i still keep dying lmao

Pray.

oh ok

Try dodging.

Also, maybe put the Shadow Mantle on Susie.

oh wow i didn't know that

this fight is purely skill, but i will say that during his attack where he starts to glow white, its nearly impossible to die, also using holdbreath makes it much easier, also the second the dialogue says that his guard is down, attack, dont heal

when i use holdbreath, it just straight up stops working after some time

use it right before his final attack then

oh ok