Uchuulon

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An uchuulon, sometimes known as a slime chuul, was a chuul implanted with an illithid tadpole. They were used by illithids as hunters and guardians.

Description
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.

Ecology
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.