 A mage becomes a lich by means of necromancy, using a magical receptacle called a Phylactery to store the lich's soul.In some sources the method of becoming a lich is referred to as the Ritual of Becoming or Ceremony of Endless Night.The process is often described as requiring the creation and consumption of a deadly potion, the Elixir of Defilation, which is to be drunk on a full moon; although the exact details of the potion are described differently in various sources, the creation of the potion almost universally entails acts of utter evil, such as using as an ingredient the blood of an infant slain by the potential lich's own hand, or other, similarly vile components.