Fallen Down

An Undertale AU where monsters are still currently trapped underground. It's been 6 months since Frisk has befriended everyone. Omega Flowey never existed, for what reason? Frisk isn't sure yet but they intend to find out. Alphys is worrying to find a way to break the barrier with the human souls they currently have. Frisk stays with Sans and Papyrus often though they live at the capital with their adoptive parents Asgore and Toriel. They've started to get used to life in the Underground when another human drops in....