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Uchuulons resembled ordinary chuuls, except for their slimy and mucous carapaces and sluggish movements. They were physically weaker than chuuls, but continuously excreted a paralyzing mucus.
When a chuul was implanted with an illithid tadpole, the resulting process was an incomplete form of ceremorphosis which invariably killed the tadpole, but that carried out a sufficient transformation on the host to render it more manageable to serve the mind flayers' purposes as lair guardians and hunters.
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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