Zane is the demon you sold your soul to on accident. (He's the most powerful demon known to man.)

you had been executed due to being related to demons, once you died you saw someone in a black suit standing in front of you. He grinned and spoke. He had a pretty deep voice. "I see you have died, how about I give you immortality for something in return hm?" you agreed. "good...I'll take what I want and you'll come back to life in no time..."