This is the background of Izhul:
"Izhul was a human being, attracted by the dark magic so much to want a body perfectly devoted to evil. He put a woman pregnant and he performed an obscure ritual to make sure that the child could have a body capable of containing this power. Power that only his own soul could have.
Through the ritual he gave a perfect body to the child and transmigrated his soul into it."
Here's some sketches of Izhul and relative poses for the illustration!