Nightmare!Sans seeing XGaster's overwrite wonder what he could create however, XGaster demanded that he can't change or create AUs and he cannot create characters that are just purely negative so he can feed off them. XGaster is intrigued by Nightmare!Sans and how he feeds on negativity so out of curiosity he helped him for a short period of time. This AU crossover is a mini story (and the epilogue to Apprentice to Error) about Nightmare!Sans and XGaster meeting in the void experimenting on SOULs. 3 Nightmare!Sans's Creation of the Dark Souls.
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