You were walking into the original Judgment hall After killing Everyone. You see an abundance of shadows at the end of the corridor.

One of the shadows stepped forward, arms crossed, and staring blankly at you with that signature grin.. “It’s a beautiful day outside.”

Another followed behind Sans, looking to be some kind of.. edgier, version, of him- with sharper teeth and one gold canine. “Birds are singin’..”

A third stepped out of the shadows, looking like a strange mixture of Sans with Papyrus’ clothing, but he had an orange jacket tied around his waist. “Flowers are blooming..”

A fourth skeleton approached, strangely equipped with a huge paintbrush. “On days like these,”

A fifth seemed to teleport to the side of the other skeleton, his form glitching frantically, as did his voice. “KiDS l-i-i-ke yo-U..”

Abruptly, the rest of the shadows became visible, revealing several, and I do mean SEVERAL more Sans-like skeletons, and an overwhelming cacophony of voices growled; “SHOULD BE BURNING IN HELL.”

You were fighting Sans, but from Several Different Universes.. Good luck, Human.

(Each Sans fights one at a time, only taking over once the other has fallen, only occasionally stepping in to help eachother rarely.)