They are the building blocks of the multiverse, the elements and energies from which all of the material universe (the Prime Material Plane, or, in the 3rd Edition, simply Material Plane) is made.
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In 1983, The Land Beyond the Magic Mirror was the first place to feature a lightning quasielemental, although the description says they inhabit the Positive Energy Plane and the Elemental Plane of Air, indicating that Gygax didn't expect anyone to know what the Quasielemental Plane of Lightning was.
Snakes on a Plane | plane | Outlands (plane) | Prime Material Plane | Jay Jay the Jet Plane | The Plane Train | Next Plane Out | Inclined plane | William Plane Pycraft | inclined plane | Col de Joux Plane | The Plane Makers | Plane Crazy | Plane (cosmology) | Opel RAK.1 (plane) | Focal plane array | Ça plane pour moi | 2006 New York City plane crash | ''X-Plane'' | Wichita State University football team plane crash | Toulmin's patent covered plane motion. | Snakes On A Plane | Plane (tool) | plane (tool) | plane partition | Plane (geometry) | Plane (Dungeons & Dragons) | Plane Daffy | Plane | Paper plane |
Gareth Knight describes its members as the "Masters" or "Inner Plane Adepti", who have "gained all the experience, and all the wisdom resulting from experience, necessary for their spiritual evolution in the worlds of form." While some go on to "higher evolution in other spheres", others become teaching Masters who stay behind to help younger initiates in their "cyclic evolution on this planet".