Nightmare can change back into his passive form when ever he wants, He just doesn't because when he wants to change back into his corrupted form it hurts him and puts a strain on his body for a few days
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Sans Au's HeadCanon's
Randomjust a bunch of headcanons idfk /I wonder how many mcyt references I can make until people notice
Nightmare(7)
Nightmare can change back into his passive form when ever he wants, He just doesn't because when he wants to change back into his corrupted form it hurts him and puts a strain on his body for a few days