Elucidated Brethren of the Ebon Night

One of the many secret brotherhoods in Ankh-Morpork, led by the Supreme Grand Master, later to be identified as Lupine Wonse, secretary to the Patrician. The Brethren summoned a dragon into Ankh-Morpork to overthrow the Patrician and restore the monarchy – they had picked their own monarch, of course.

They were made up of a circle of honest seekers after mystic truth whose misfortune it was to let Lupine Wonse run the group. A Supreme Grand Master with an agenda of his own is always going to be bad news in a secret society.

One of the brothers, Brother Fingers, stole a potent grimoire from the Library (indirectly the reason why the Librarian signed on as a Special) and so starting the events leading up to summoning the dragon.