Determinatale Betrayer

A story where the Monsters managed to get to the surface somehow. However, Chara still has Frisk's SOUL...

Story
So, this story has a bit of difference and mix in the story but it is still understandable. This story should start at the place where the Monsters received Compatible DT. Everyone in the Underground received DT except, Chara wasn't resurrected from the dead. She was still a demon that was still searching for a suitable body to possess.

Three years later, a human fell into the Underground and she introduced herself as Frisk. She had the SOUL of DETERMINATION and she spared everyone. Chara saw her potential and started a connection between Frisk and herself. Frisk, doing many pacifist routes, felt bored since there was nothing else new every time she RESET the world. Chara then told Frisk to do a Genocide Route. Frisk, feeling bored and hoping to see something fascinating and new, agreed and they started on a Genocide Rampage.

Soon, the Monsters had lost faith and Chara has almost controlled Frisk's body when Frisk decided to do a pacifist route since killing everyone, made her felt bad. She wanted to make up for everything she has done, especially Sans, who could remember what had happened the last Timeline when she killed everyone.

Soon, Frisk, again, became the saver of the Underground, and the Monsters somehow used their full power on breaking the Barrier. The Barrier was finally broken and the Monsters were free from the Underground. Except, something was odd. Something changed.

Soon, Chara managed to take complete control of Frisk's body and she started on a new Genocide Route on the Surface...

Sans
The only one and the last hope of the Monsters. Sans still believes in Frisk even if she killed everyone. He believes that Frisk can change for the better but what Sans doesn't know is that Chara has complete control over Frisk's body so even if Sans tries to negotiate with Frisk, it would just be a waste of effort.

Other Monsters
All Dead.

Ĝæßþër
Üñkñœẅñ ðæþæ fœüñð.

Trivia

 * Determinatale Betrayer was inspired by GlitchDtale.