The ritual of sacrifice
The gods always urge for sacrifices of mortals. One of the greatest sacrifices a mortal can do is to perform the Ritual of Sacrifice. According to legends this ancient ritual has only been performed once by a king named William Amberley, but he died instantly after completing the ritual. All books and scrolls about his doing and his research about the ritual was removed and hidden by someone of the family. They are still supposed to exist within the Amberley Mansion, but no one has been able to find them.