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At the end, the Nightmare we were fighting was indeed him, Sofia's Familiar, the [Six-Winged Archangel Automata].
However, it was twisted and demonic, having given up "his heart" to protect and make Sofia "happy", which most likely was what created the Nightmare Lord.
Therefore, his true form would be completely different…
He said he wanted to make her happy, but he's unable to understand that whatever happiness Sofia is going through, it isn't real.
It seems unaware, or simply doesn't care if she'll die afterwards, as long as he made her happy before…
Indeed, despite having good intentions, it cannot think like a human.
FLUOSH!
The sparkling golden light left behind by his body parts gathered together, suddenly forming something. The mannequin parts melted into miasma, fusing together into something resembling Sofia's Familiar.
