TheFreedomSkeleton
This Undertale AU tells the story of what happened to the monsters on the surface. Misunderstandings and accidental events led to the creation of a huge machine called "Omega", which now terrorizes everything around it with the help of its underlings. The outbreak of war has forced monsters and humans to hide from daylight in the gutters of this vast city. Frisk, who once destroyed the barrier, will once again have to deal with a problem of global proportions.