DeterminedPancakes

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⚠DISCLAIMER! This is an Undertale continuation AU based off of head canons & theories. Not everything is accurate to canon.⚠
Frisk is running through another Pacifist run when they uncover strange lab entrees that reveal secrets about the previous Royal Scientist. These secrets could change the fate of Asriel, Chara, & everyone in the Underground. But what happens when an enemy who they thought was long gone makes a re-appearance?