Based on the Church of Freya, the group have been hiding in the shadows, otherwise known as the Valhalla Temple. They believe in the Evil Spirit of Water, and they want the world to be covered in Darkness. Among those 12 Leader, one of them lived as the founder of Baseurin. It is peaceful during the day, but when the sky turns into night, a festival of Cultists unfold. The overall achievement goes exactly as they wanted."
Baseurin is not safe. The Embinyu Church was more of a threat to the peace of Versailles Continent than the Legions of Undead.