Pleasure to meet ya. Name's John Constantine. I have experience dealing with demons. As a mage and exorcist, I have the knowledge and skills to defeat and banish demonic entities. As part of my daily job. I deal with supernatural threats on a regular basis. When I was young, I did see demons. In fact, my first encounter with a demon was when I saw a granny turned into a very ugly creature. It was a terrifying experience, but it's what led me down the path of becoming a mage and Exorcist.