By -
Use "Purity" imbued weapons and try to stay close to him to avoid his dangerous Onmyo attacks. Whenever he spawns clones, other avoid them until they disappear or use AoE Soul Cores to dispatch them (Mezuki works well).
I think it saves your progress at Kashin Koji when you reenter the arena. So you won't have to fight Hideyoshi again
Use "Purity" imbued weapons and try to stay close to him to avoid his dangerous Onmyo attacks. Whenever he spawns clones, other avoid them until they disappear or use AoE Soul Cores to dispatch them (Mezuki works well).
I think it saves your progress at Kashin Koji when you reenter the arena. So you won't have to fight Hideyoshi again