When Foresight is teleported to the 6th Floor Arena, they find themselves face-to-face with Ainz himself. This battle is less of a duel and more of a grim experiment. Ainz uses this encounter to:
While Ainz is technically defending his home against "robbers," the sheer power disparity and the cruel fates he assigns to the survivors (including the tragic end of Arche) make it clear that Nazarick is not a "good guy" faction. 8 : A Handful of Hope
He engages them in melee combat to see if he can improve his physical prowess without relying purely on magic. When Foresight is teleported to the 6th Floor