Haven

Although the smallest of the three satellites Haven was extremely important to the Illithids. Less than 5 miles in radius, this moon was a hollowed-out asteroid that orbited between the first and second rings of its parent planet. The surface was devoid of life, but the interior was oxygenated, and many molds, fungi, and mushrooms purified the air. The tiny satellite was used as a neutral meeting ground for rival illithid factions. Spelljammers entered through a hole at the south pole of the rock. Only illithid ships were permitted to enter the moon. A ship that did not belong to an illithid—and thus did not have a very good reason to be there—was unlikely ever to leave again.