Father Luciel

672 years ago , demonic possessions occurred very frequently , so a writer named Dante Alighieri agreed to take part in the trials of hell , having to to through all nine circles in order to meet the king of hell Satan in order to grant him his wish. After Dante passed all the trials and meet Satan , who granted his wish to stop demons from interfering with humans, 574 years later after philosopher Friedrich Nietzsche declared that God is dead , humanity lost all connections with heaven. Upon hearing this , many demons began trying to possess humans and invade the human realm even though Satan ordered that such act is forbidden. Panic took over the world as many possession cases appeared all over the world , and many places became haunted by evil spirits and entities. Upon hearing this , Satan has made contact with the pope of Vatican , offering power to deal with the invaders via contracts with various demons from hell. Seeing how hopeless the situation was , he had no choice but agree and the deal was made. This is how demonic priests , or how they are mostly called by people "Dark Priests" appeared.