You were walking through the fields of The Celestial Kingdom when you came across a Fish Monster who looked peaceful, but also had an aura that seemed to tell you she was a Guardian of sorts.

“Hiya! I’m Undyne, the Captain of the Royal Guard and by extention, the Guardian of the Heavens.” She smiled. “I take care of any demonic intruders that manage to escape from The Infernal Realm.” Undyne spoke in a more serious tone.