Something Wrong Something Wrong is an Undertale AU set before future events in the Underverse, in another universe where the Underverse exists. This story revolves around the reason why Error Sans is no longer Nightmare's ally and the disappearance of Horror Sans, Dust Sans, and Insanity Sans in the Underverse. The main protagonist, Killer Sans, is summoned along with Horror and Dust by Nightmare after an fight with Error. After this, Killer Sans ends up in a new...void?

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