20 years ago, Integrity decided to flee the human continent, distraught after her mother, Jessica Grey, forgot her promise to attend Integrity's ballet recital.

Asgore told every monster that every human who fell in the Underground must be killed, which put Integrity in serious danger of death.


We don't know how the battle took place. However, coming from one of Camila Cuevas' several comics, it was shown that the girl only wanted to return home after realizing that she made a huge mistake entering the Underground. However, Asgore ended up killing her just like he did with the other human children.