"FantasyFount" is an UNDERTALE AU taking place after the Neutral Pacifist Ending(AKA Family Ending) of the game, in which Frisk leaves the Underground alone after Asgore was killed by Flowey.

This timeline follows Queen Toriel, Sans, Papyrus, Undyne and Alphys and their attempts to find a way to break the Barrier by using a device called the Dark Well, which was reconstructed from Sans's abandoned blueprints.

To those familiar with DELTARUNE, this machine is used by the monsters to create Dark Worlds which they explore and traverse in order to help unveil the lingering mysteries of the Underground.

FantasyFount is a story in conversation with both UNDERTALE and DELTARUNE, and background knowledge of both is recommended before reading more about the AU.

However, if you are prepared to dive into the depths once more, you can click the various navigation windows to learn more about Dr. Alphys's latest experiments...