Endurance - Gaster x Reader

Endurance - Gaster x Reader

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WpMetadataReadOngoing2h 40m
WpMetadataNoticeLast published Fri, Jun 26, 2026
So, it just so happens that the core is going into meltdown and someone had the awesome idea of asking its creator to help. Small problem with that though... he apparently kind of doesn't exist anymore?! How to resolve this? Simple, send someone into the past, namely you, to go and ask them. With everyone's hopes and dreams resting on your shoulders, let's just keep our fingers crossed and hope you can convince the monsters not to kill you and persuade the one and only W.D. Gaster you're not a lunatic and get help. Surely it will go just smoothly, right? No problems at all. I mean, it's not like you're going to fall for a guy that will eventually disappear from existence, right? You must ENDURE!
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riverperson
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I have an Idea for an Undertale AU. And apparently, it's a good idea? So here, have a book. --- Long ago, two races ruled the earth. But when a plague of corruption swept through one species, causing a half of their population to attack the humans, the humans thought it safer to banish all the monsters underground. Now, the Underground is a Battleground. The battleground of the Pure and Corrupt armies. This Is UnderCorrupt. -- COMPLETED!

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