Fics like It's All Just Training, Right?

Hopping from universe to universe after his own Anti-Void no longer suffices as a safe place from the chains of Fate, Error winds up in Nightmare’s Castle with none other than the God of Negativity himself, who’s far too pleased with the Destroyer’s presence. Unaware of Nightmare’s true intentions, Error finds himself taken aback by a suspicious yet remarkable deal that very few people have the courage to propose. It was meant to be a simple session, a once-in-a-lifetime opportunity, but then the both of them find out that there might be more to their meeting than meets the eye… - updates every Tuesday and Friday

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