Lucifer's head dress.

God's fallen angel Lucifer, Satan. Once God's right hand. 

Some have Disney or other fairytales, I think this one in particular is one that interests me.

It's my inspiration for Kieffer afteral. 
Once studying at the Vatican. Serving's God's will, learning and aiding Priests in expelling demons from their human host. 'Excorcism'
He found the actual reason and meaning behind the other side a lot more appealing then his own cause. He is no Christian or true believer, as far as they were concerned he was.
He realized this wasn't for him. He could do better.
He wasn't interested in serving someone he didn't knew, had no way of contacting, he wanted to serve a cause that would also give him benefits, and make him feel more alive while practically being dead.
Exhanged his soul for the greater good, to get what he wants in life, even if it means he has to take it with force. Loyal to he who allows him this power.

Right hand of Lucifer.