The Demon

The Demon is the name for Master Chief by the Covenant. Their beliefs most likely show of a 'Demon (Master Chief) helping the holy enemy (Humanity) to destroy the great sancutary(Halo)'.

The Covenant) fear the Master Chief because of his attack on Installation 04, the murder of hundreds if not, thousands of soldiers, and of course, the destruction of Halo. If any soldier meets this 'deamon', they are to warn their supperiors, and other members of their troop.