Mysterious Encounter

The True Pacifist route has been completed and all monsters were free to live on the surface. Humans and Monsters lived in peace. Though not everything remained peaceful for the main cast. It all started when Sans started developing an unknown serious illness. He was then chased all night by a shadowy figure and got badly hurt when it caught up to him. Sans became severely hospitalized in the process heavily on life support with only a tiny amount of HP left. Other things started happening to the others at the same time. Toriel, Frisk and Papyrus went missing. Muffet's bakery was destroyed and robbed. Fire alarms went off in several buildings. Mettaton had his legs ripped off and needed repairs. Undyne was somehow kept awake for so long she started experiencing hallucinations. Asgore and Alphys needed to get to the bottom of these weird things happening and needed to find their missing friends before things get worse.

This is a small Halloween Undertale fanfiction I'm doing. Be warned this is pretty scary and dark.

Undertale and all of the characters belong to Toby Fox except for the ones I make up.

Art is not mine.