Sans convinces Toriel to leave the Ruins for just one day. It doesn't go as she expected.
ReaderRose was discussing the lack of any material for this ship on Tumblr and this idea was tossed around. I decided to try my hand at interpreting it.
I don't know what I'm doing anymore.
fierce; cruel; dreadful; savage.
fell poison; fell disease.
There must be a million of these out there, but I thought I'd experiment a little and try novelizing what I imagine Underfell to be like. Follows for the most part established personalities and important moments, but there are some twists.