RNG is only the pain proc from equipment. AF turn 1 is a little tricky, Tsukiha aims for main body to debuff fire while Ewan aims for the body parts, because he can't absorb HP on main body. Main DPS in the AF phase.

Tsukiha and Ewan stats have been adjusted to lower shadow so it should be possible to do at lower shadow, but I cannot 100% confirm. If you are unable to kill all body parts in turn 1, aim for the head and powered arm.

0:00 The Fight
7:29 Equipment and Setup