Hundreds of years ago Morgaine le Fey attacked Camelot in an attempt to get her hands on the Eternity Book which she intended to use to prolong her life.In an act of desperation Merlin summons The Demon Etrigan.The plan fails but as Camelot falls Merlin gives Etrigan a page of the Eternity Book so that he will be able to summon him in the future.