About the AU

Underdecay is a world where the constant resets actually start to affect not only the characters, but HOME itself. No matter the path, kindness or violence, every reset leaves a permanent mark against the new timeline, similar to a scar that never fades.

Each reset leaves a small impression on the monsters that interact with the fallen human, the result of which becomes more and more prevalent with each new reset. The monsters are slowly becoming more aware about living the same life over and over as moments of deja vu and unexplained intuition seep into their lives. The past royal scientist took it upon himself to try to mitigate the damage caused by perpetual resets and for the most part actually succeeded but in his absence, the world slowly falls into decay.

About Decay!Gaster

He’s the past royal scientist that have been remplaced by Alphys when this one ‘fell into his creation’.
No ones remember him.
???

Art & Underdecay©

Undertale© Toby Fox

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