I was thinking of doing something more light like water or wind, but in the end that's the result hahaha
The drawing is a mixing of color pencil and acrilic ink.

Let me explain this guy, my ideia is that he can recreate the worst fears of his victims by manipulating this black fog. It penetrate in the heart and make the person drowning in the most deeper despair.
I think after seeing all his victims going crazy, he lost a little of his mind too.