You got out of Ruins after defeating(aka, just sparing toriel/or kill her). Standing outside, you look back at the giant purple gate that was both the entrance and the exit of the Ruins. Though, happy doesn't stay for a second as a skeleton figure stood a few meters away from you. Their left eye seems to glow a bright orange. Before you could do or say anything, they spoke up.

"i will teach your grandmother how to suck eggs."

*BATTLE, START!

Well, guess you're gonna need some painkillers... because it's gonna hurt.