Ennism is a monotheistic religion which spread throughout much of Mersia, especially Aden, following the events of the Crosslink Saga. Its adherents are known as Ennians.

The core of Ennism is the belief in intelligent design, particularly the belief that there is a single deity who was responsible for creating the entirety of the universe, and that this entity did so out of love for the act of creation. This deity is known as En.

Cae Lawrence is regarded during the Golden Age as a messiah who has carried the will of En to the sapes of Mersia, and then disappeared as he ascended to Paradise.