A Marid (Arabic : مارد ) in common mythology is a djinn related to the element of water. Marids are mentioned in the Qur’an in Sura As-Saaffat:7 (37:7): And to guard against every rebellious (Marid) devil.
In sorcery books djinn are classified into four races after the classical elements, where they live: Earth, Air, Fire and Water. As common in the occult, accounts differ, but marids are often described as the most powerful type of djinn, having especially great powers over water. They are the most arrogant and proud as well. Female or male, their skin is deep blue or green, and their hair always looks wet and wavy, as though underwater. They are sometimes referred to as “blue djinn”. Like every djinn, they have free will yet could be compelled to perform chores. They also have the ability to grant wishes to mortals, but that usually requires battle, and according to some sources imprisonment, rituals, or just a great deal of flattery.
Marids were recently mentioned in modern literature in Jonathan Stroud’s Bartimaeus Trilogy. They are associated with the element of water. Further, they are considered the most powerful of all of the Demon classes that are generally accessed by wizards. References to marids were sparse in the books. In the books, Gladstone’s Staff was said to possess two marids’ worth of Power. Also Bartimaeus described them as leaving a trail of Power like sludge. Both references mentioned are located in The Golem’s Eye. Marids were also mentioned in the P. B. Kerr’s Children of the Lamp children’s book series as the most powerful tribe of djinn who presided over good luck