Irithyll of the Boreal Valley is a location in Dark Souls III. This ancient fabled city is found in the cold Boreal Valley. There is a cathedral dedicated to the Darkmoon at the center of Irithyll where the moon shines above it, never fading. Deacons, Fire Witch, Irithyllian beast-hound, pontiff knights and sewer centipedes are only some of the dangerous creatures players should look out for in this area. Before leaving Irithyll of the Boreal Valley to move to the next level, players must defeat the boss, Pontiff Sulyvahn.