1. Summon the AI in one of the cells he uses soul spears DMG them up, kill first one then stay on top firing a bow or magic at them until one is left. 2. Summon real people to help 3. By yourself. Kill first one, wait until one gets up to ledge fight it. If forced to the ground they do combo attacks so DODGE and WAIT until you see an opening slash/slash, repeat. Focus on only 1 RuinS if you can. I think I hit them mostly after their spinning attack my first time through. It's been awhile for me lol...