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Alhoons were magic-using outcasts from mind flayer societies who had defied the ruling elder brains to achieve a limited form of lichdom. Only the most powerful mind flayer mages could achieve true lichdom and were known as illithiliches; however, many in the Realms did not make this distinction.
Alhoons looked liked they had in life except that their skin possessed none of the wet, smooth, slimy texture of living illithids, instead, appearing dry, wrinkled, and cracked as a result of the powerful magic resistance that had prevented a perfect conversion to lichdom. They had to work hard to keep their skin hydrated—such as by taking frequent baths or by consuming liquids—or else it would begin to dessicate.
Many Alhoons had been wizards or sorcerers in life, and thus combined these abilities with with their innate skill at psionics and the formidable resilience of a lich to become truly dangerous beings.
The powerful combination of arcane magic and psionics wielded by alhoons led them to become a threat to the established order of the Underdark and beyond as of the mid-to-late 14th century DR. They were ignored, feared, and hated by mortal illithids for their rejection of the illithid circle of life, culminating with the physical and psychic merging with an elder brain.
Due to conflict between Netheril and the race of phaerimm. In −339 DR, Netherese sorcerer-kings Ioulaum disappeared from Netheril as phaerimms' lifedrain spells were causing his life-sustaining magic, Ioulaum's longevity, to fail. Ioulaum embraced lichdom and established a lair in the depths of the Northdark.
The first illithiliches are believed to be the students of Ioulaum recruited from the nearby mind flayer city of Ellyn'taal that called themselves Alhoons. Ioulaum’s intentions for recruiting mind flayer students became clear when he created an undead elder brain from the minds of his illithid students and then merged his own sentience into it. Most of his illithilich apprentices were destroyed in this arcane ritual, but a few escaped and spread the secret of illithilich creation to mind flayer communities throughout the Realms Below.
Ioulaum's last human apprentice, Tabra, thought the mind flayer students had betrayed their master and murdered him. To avenge her master she cast the now perfected Ioulaum's longevity spell in midst of the city of Ellyn’taal and slaughtered the last few of remaining mind flayer inhabitants.
In 1369 DR, the alhoon who dwelt within the ruined Myth Drannor and its Dwarven Dungeons were driven out by members of the Cult of the Dragon and their red dragon dracolich ally, Pelendralaar.. In the same year, alhoons were known to have taken up residence in the abandoned drow city of Telnarquel.
- Hwarlg, the illithilich who found his way into the Crypt of Rothilion in Myth Drannor's Polyandrium but ended up trapped inside by the tomb's arcane defenses in 1369 DR.
- Ralayan, an alhoon who served as right hand to Priamon Rakesk of the Twisted Rune.
- Undermountain: Stardock • Pool of Radiance: Attack on Myth Drannor
- The Nether Scroll • Dissolution
- Referenced only
- Pool of Radiance: Ruins of Myth Drannor • Silverfall
- Video Games
- Referenced only
- Pool of Radiance: Ruins of Myth Drannor
- Organized Play & Licensed Adventures
- Stardock Under Siege
- Steven E. Schend (1998). The Fall of Myth Drannor. Edited by Cindi Rice, Dale Donovan. (TSR, Inc.). ISBN 0-7869-1235-9.
- Eric L. Boyd (1999). Drizzt Do'Urden's Guide to the Underdark. (TSR, Inc), p. 22. ISBN 0-7869-1509-9.
- Ed Greenwood (March 1993). The Ruins of Myth Drannor. Edited by Newton H. Ewell. (TSR, Inc.). ISBN 1-5607-6569-0.
- Richard Lee Byers (August 2003). Dissolution. (Wizards of the Coast). ISBN 0-7869-2944-8.
- Mike Mearls, et al. (November 2016). Volo's Guide to Monsters. Edited by Jeremy Crawford, et al. (Wizards of the Coast), pp. 171–172. ISBN 978-0786966011.
- Bruce R. Cordell, Eytan Bernstein, Brian R. James (January 2009). Open Grave: Secrets of the Undead. (Wizards of the Coast), p. 164. ISBN 0786950692.
- Richard Baker, James Jacobs, and Steve Winter (April 2005). Lords of Madness: The Book of Aberrations. (Wizards of the Coast), pp. 157–158. ISBN 0-7869-3657-6.
- James Wyatt and Rob Heinsoo (February 2001). Monster Compendium: Monsters of Faerûn. (Wizards of the Coast), pp. 89–90. ISBN 0-7869-1832-2.
- Carrie Bebris (2001). Pool of Radiance: Ruins of Myth Drannor. (Wizards of the Coast), chap. 3, p. 59. ISBN 0-7869-1387-8.
- Richard Baker, Ed Bonny, Travis Stout (February 2005). Lost Empires of Faerûn. Edited by Penny Williams. (Wizards of the Coast), p. 101. ISBN 0-7869-3654-1.
- Ed Greenwood (August 1999). Silverfall. (Wizards of the Coast), p. 24. ISBN 0-7869-1365-7.
- Sean K. Reynolds (2000). Pool of Radiance: Attack on Myth Drannor. Edited by Michele Carter. (Wizards of the Coast), p. 43. ISBN 0-7869-1710-5.
- Steven E. Schend (January 1997). Undermountain: Stardock. Edited by Bill Olmesdahl. (TSR, Inc.), pp. 14–15. ISBN 0-7869-0451-8.
- Steven E. Schend (1997). Lands of Intrigue: Book Three: Erlkazar & Folk of Intrigue. (TSR, Inc), p. 22. ISBN 0-7869-0697-9.
Gnome ceremorph • Gnome squidling • Mindwitness • Mozgriken • Tzakandi • Uchuulon • Urophion
Brain golem • Cranium rat • Nyraala golem • Illithidae • Illithocyte • Intellect devourer • Mind worm • Neothelid • Nerve swimmer • Oblex • Oortling • Ustilagor