The idea was originally found in A_Bored_Reader Undertale ideas for stories that hit me like the brick called Reborn! I asked permission to use it. Read the original if you're interested, but it contains quite a few spoilers for this story.
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Negativity was part of his being in his previous life and no matter how strong the negativity of the Universe was, he could handle it. But no matter how good his emotional control was, gathering his own negative emotions wasn't a good idea even for him! This was also proved by the way how unleashed his power was during his transformation and that he killed the Villagers, depriving him of the opportunity to torture them! And although the positivity hurt him in the past, he grew up with Dream, he was able to handle it. And it has time to prepare for Dream's return.
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But his knowledge did not change the fact that in this life he had no enough experience, for his body to handle the Negative Waves passing through the entire Multiverse. He wondered if Dream feel it like this when his Negativity broke out?! It must have been quite suffocating for him! No wonder he couldn't fight properly and he became a sculpture...
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[I couldn't find a better one.]
His suspicion was confirmed when he pulled up the sleeve of his dress, the traces of becoming a sculpture were visible on his radius. [Forearm bones.]
– Can we help somehow? – whispered Error / Goth seeing the problem.
– We'll deal with it after lunch! – Nightmare / Palette with a faint smile. Error / Goth nodded, accepting his decision. And Nightmare / Palette hid the „wound" again, not wanting anyone else to see it.
– Do you want to help set the table? – Geno offered a distraction with a soft smile.
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