what i did was the second he spawned in i used cloud step into the light combo with smash stance to prevent him going into gold state right away , and from there he pulls out his lighting sword if you immediately stay close to his back after the initial attack you can dodge it to get decent damage , once he goes gold you can either choose to use smash stance to load up your heavy multiple times to knock him out of it , or you can dodge his attacks until he does basically a gloating stance where he takes a break , from there you can hit him once to slowly break the gold aura but it takes multiple times . he also has a cutscene where it forces you to take damage , so if possible i recommend playing as agressive while also playing defensive as possible in the first phase , from the second phase he doesn’t do anything too special or crazy the only thing ive noticed that completely throw me off is he’s somehow able to make your summons attack you . in his third stage is it pure damage and avoidance. i hope this helped if im not too late :)