Damien started off as an angel of high ranking at his creation. He was typically assigned as a guardian angel although would occasionally be assigned other tasks as well. In his time on Earth, he grew more interested in how humans lived, and decided to try and experience some of it himself. Over time he bagan to get caught up in mortal pleasures. When he started ignoring orders from heaven, his dabbling in the "unholy" practices of mortals was discovered and quickly got him cast to hell as a fallen angel.
After some time, Damien was confronted by an angel named Asher sent by heaven to assassinate him. The two of them had a long, intense fight leaving them both gravely injured and scarred. After some time, Damien became aware that Asher had, like himself before, been cast out of heaven becoming a fallen angel. Upon meeting him and seeing him struggle to adjust to hell, though hesitant, he took pity on him having been in his shoes before and offered him help. From there, the two grew a strong bond.