One Last Promise  | An Undertale Fanfiction

One Last Promise | An Undertale Fanfiction

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WpMetadataNoticeLast published Sat, May 9, 2026
It has been five years since monsterkind left Mount Ebott with the help of Frisk. Now a teenager, that's six months they had been living far from their people with Toriel, who got hired as the first teacher for humans and monsters. Frisk lives that forced exile badly, but summer vacations are close enough to go back to New New Home and see all those they left behind. Soon enough, Frisk realizes something is wrong with Sans. Despite the forced smiles, the skeleton is suffering in silence. Worried, Frisk decides to investigate. Is he still mad for all these timelines they did something irredeemable, or is it something deeper? One thing is for sure, those vacations won't be like the others.
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In human history, it spoke of a great scholar said to be blessed by heaven themselves. He knew much about the intricacies of this world, and knowledge of both the world's history of the word of God. In debates, he would only be able to sway others into taking a path more suited to what the Father may want from him. He was the renowned Fount of Knowledge, a Demigod carrying the Soul Gem of Knowledge, a very kind individual who helped anyone in need. However, the longer his life went on, there was something he began to notice from the masses. They don't listen, or rather they don't listen to the truth he imparted on them. They would much rather believe in a lie than to simply accept the truth of reality. The details from this point on are a little... foggy. Nobody knows when it happened, but at some point the esteemed Fount of Knowledge had succumbed to the corruption of Sin. Through the lies humanity would birth one of the greatest mistakes this world had created- the Beast of Deceit. Utilizing the corrupted power of the Light of Knowledge, now the Light of Deceit, the Middle East became a world of utter chaos. Realizing their mistake giving such power to a mortal, Heavens rained down divine judgement. Tridents made out of angelic steel pierced his soul, binding his power, before being cast into the depths of Hell. His name was written out of history books, and soon became forgotten across the lands... but in Hell his world of Chaos was far from over.

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