Genies come from the elemental planes. There, among their own kind, they have their own societies. Genies are sometimes encountered on the Prime Material Plane and are often summoned specifically to perform some service for a powerful wizard or priest. All genies can travel to any of the elemental planes, as well as the Prime Material and Astral planes. Genies speak their own tongue and that of any intelligent beings they meet through a limited form of telepathy.
Note: Genies originally appeared in this form in the Al-Qadim: Land of Fate for the AD&D game from TSR. Their use here is for the purposes of providing context for the campaign only.