The Order of the Black Worm was a cult created by the necromancer Mannimarco, known across Tamriel due to their infamous practices of necromancy. They were involved in several events of major importance across the history of Tamriel, such as the battle where Vanus Galerion was killed, the Planetmeld during which they were allies of Molag Bal, and a plot against the Mages Guild during the Oblivion Crisis in the Third Era.