GlitchTale Bete Noire
GlitchTale Frisk

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Gaster teleported Asgore, Asriel and Frisk to the school.

While they were leading the battle on the school, Gaster decided to track down Betty with the help of Alphys and Jessica Grey

Somehow, with Jessica's device they found Betty's location and decided to go to the CORE.


At the beginning, after that they localized Betty, Gaster trapped her inside of the CORE's expansion, and decided to fight her.

Despite the fact that he gained more power from Sans's death and his effort, he couldn't beat Betty and Akumu due to his lack of determination and that the "Rhabdophobia" attack was used in order to take out his own weapons.

At the end of the battle, Betty speared his soul without killing him. But Jessica and Alphys interposed and neutralized Betty and her beast.

Alphys modification to Gaster's plan (At the beginning, Alphys had to activate the Nullifier room in order to kill them) and decided to close herself in the nullifier room for trying to kill.

Alphys will die despite her worthless efforts killed after that Undyne came to rescue her, only to accidentally kill her.