
Well if you cared to read, it was because of an old artifact he had with him. That artifact used to be able to show his original form, but it has been a very long time ago since, so the artifact's power must've been reduced. But because of the first "treatment," his curse was reduced enough to the point that the artifact could work.

I know about the artifact. What I'm talking about is when the part where they are confident that the curse is cure and the mc ask for his name, we can see that his skin turn bright and his lower body's skin is brownish meaning that his skin is white. But then when he look at the mirror and realized that the curse doesn't really go away his skin turn black again. Maybe it was a metaphor that he feel despair even though he just got his hope up getting cured. Besides, the artifact doesn't show his original form, it was just a from that the artifact made up for others that see him.

Yeah. We don't know his original form.....
Just that he said he doesn't like how he looks so he wears the helmet all of the time. And the curse has been too long so whatever original form he had got fused with or as someone else had said : corrupted: his body so it no longer looked like how it used to be. And he sees himself as a monster now. But whatever form it was the mage was ok with it.
Like he just turn black skin and then they called him monster ???? Or is there really something different to his face? Seriously I'm curious now show me his face please