Anti void

So what if reaper...lost his memories but gained someone elses when he becomes error reaper?

(Different everything, so instead of geno sans being used to become an error to destory, reaper sans, who was holding geno and his souling, ended up getting grabbed and pulled into the anti void on accident, of course reaper ended up losing his memories but gained memories of some random human who loves undertale and some aus and the multiverses and has some knowledge on things etc, it's still reaper who becomes an error reaper, but he just didn't Remember anything from his past life, so he assumed he was a human who died and transported because of the memories

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