Neothelids were voracious and destructive, constantly searching for intelligent lifeforms so as to eat their brains. They were ferocious predators driven only by a desire to consume. Their low intelligence made them undetectable even by elder brains.
Neothelids were slime-covered worms with a quadri-tentacled mouth that resembled gigantic versions of illithid tadpoles. They were often mistaken for purple worms due to their purple skin, and massive larval body structure.
Neothelids shared numerous abilities with illithids and elder brains, capable of levitating at will, resisting magical abilities, sensing sentient beings, and possessing blindsight. A neothelid could send the minds of its prey into disarray and use telekinesis to move things around it, although its poor mind meant this was taxing for it. It was also capable of breaking the minds of its victims and dissolving their bodies in its acid breath, leaving only their brains unharmed.
Neolithids could use their mouth tentacles to squeeze and draw in prey, swallowing them whole and digesting them from inside their stomachs. If hurt too much from the inside, they would have to resist the urge to regurgitate their prey, and those who survived being consumed could crawl out their carcasses.
To create a neothelid, not only must an illithid tadpole not undergo ceremorphosis, but the elder brain of the colony must be absent, as the elder brain would normally eat all tadpoles that failed to undergo ceremorphosis. Without the elder brain, the tadpoles would be forced to engage in cannibalism in order to survive. If one tadpole survived the resulting chaos, it would grow to the size of a dog, forced to flee its home and feast on rats and other vermin until it grew larger. Without the ability to create tunnels of their own, they relied on preexisting tunnel systems to travel, eventually relying on purple worm tunnels to travel in. The process of becoming a neothelid completed when it digested a sentient mind. Doing so caused a similar reaction to that caused by the consuming the host's brain during ceremorphosis, granting the neothelid self-awareness and psionic powers. They constantly hunted for new brains, dissolving their victims' bodies with acid breath and devouring the untouched brains.
Mind flayers saw neothelids as abominations and never normally created one willingly, since allowing one to exist was one of the largest taboos in their culture. Likewise, a neothelid had no knowledge of its link to the mind flayers and would gladly consume them the same as any other sapient being.
In the late 15th century DR, the ulitharid Extremiton and its colony in the Seadeeps deliberately bred a neothelid with the purpose of unleashing it upon the githyanki contingent in the Crystal Labyrinth of Undermountain.
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- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Wizards RPG Team (2016). Volo's Guide to Monsters. (Wizards of the Coast), p. 181. ISBN 978-0786966011.
- ↑ Bruce R. Cordell (April 2004). Expanded Psionics Handbook. (Wizards of the Coast), pp. 204–205. ISBN 0-7869-3301-1.
- ↑ 3.0 3.1 3.2 Bruce R. Cordell (April 1998). The Illithiad. Edited by Keith Francis Strohm. (TSR, Inc.), p. 95. ISBN 0-7869-1206-5.
- ↑ 4.0 4.1 4.2 4.3 Eric L. Boyd (1999). Drizzt Do'Urden's Guide to the Underdark. (TSR, Inc), pp. 22, 43. ISBN 0-7869-1509-9.
- ↑ 5.0 5.1 Richard Baker, James Jacobs, and Steve Winter (April 2005). Lords of Madness: The Book of Aberrations. (Wizards of the Coast), p. 67. ISBN 0-7869-3657-6.
- ↑ Christopher Perkins (November 2018). Waterdeep: Dungeon of the Mad Mage. Edited by Jeremy Crawford. (Wizards of the Coast), p. 221. ISBN 978-0-7869-6626-4.
Brainstealer dragon • Mindwitness • Mozgriken • Tzakandi • Uchuulon • Urophion
Brain golem • Cranium rat • Nyraala golem • Illithidae • Illithocyte • Intellect devourer • Mind worm • Neothelid • Nerve swimmer • Oblex • Oortling • Ustilagor