{DISCONTINUED}
When the battle was finally over, Frisk broke the barrier, and the one last soul was saved, Frisk managed to bring back Asriels soul to his old body, humans and monsters finally lived in peace. Frisk became the ambassador of the monsters, it all worked out perfectly well.
But little did they know that, someone was watching them fight, or to be exact, mercy all of the monsters. They were so thrilled by Frisks determination, their will to live came back, and their soul finally collided with their dead, cold body.
Chara was finally brought back to life, by no one other than Frisk.
The barrier is broken, monsters and humans are living in peace, everyone is happy except for one person. Frisk has been getting waking nightmares about not saving Asriel. They want to save him to erase all guilt and to be with their friend. But Asriel isn't the only one that needs to be saved. Something, someone lurks inside Frisk's soul. Someone deadly and has a hunger for power, and can kill anyone they want.
A/N Frisk and Chara are both gender ambiguous in this story. Also there will be a little bit of Frisk x Asriel in this story, but this is not a Frisk x Asriel fanfiction. Credit to @karinacat59 for the cover. Undertale belongs to Toby Fox and none of the characters are mine.