Undertale: Determination's Demon.

After constantly being rewound back to when he'd first fell to the Underground at the end of netrual run, 13 year old Frisk hears a voice in his head that he'd never heard Before and began to find his body being controlled by another force of some type, forcing him to do Genocide.

Will continue in Determination's Destination.

Undertale and Characters seen in the games belong to Toby Fox.

New characters NOT in Deltarune or Undertale games belong to me.

While based off of the cannon game, it is still an AU of sorts, so don't expect 100% accuracy to the game's dialogue and story. This is just my own spin of things, so don't expect things to be perfect.