Brainstealer dragon

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A brainstealer dragon was a mix of illithid and dragon. They sometimes ruled illithid settlements that did not have an elder brain  or escaping Elder Brain control and surpassing their creators.

Description
Like most Illithid and their creations, Brainstealer Dragons had squid-like heads and brain devouring maws. They possess white bloated eyes above the 4 tentacles drooping from their heads. Their draconic bodies are covered in small purple scales and their wings reduced to fleshy flaps of eldritch skin.

Personality
Brainstealers adopt the conniving personalities and manipulative minds of their Mind Flayer creators. They would dominate the minds of underdark denizens, with even Illithids joining the ranks of their minions. They were more skilled in deception and intelligence gathering than their normal dragon counterparts.

Combat
The Brainstealer's powerful draconic build, is aided by its diverse array of mental abilities.Like their Illithid kin they could use a mind blast to mentally debilitate their prey, stunning them for ease of consumption. Then they would commence brain extraction, killing one-headed creatures, as they hungrily swallowed their brains.

Their skin was immune to acid, and grew in resistance to non-magical means of attack as they grew older. The downside to their transformation was that they're 'wings' were far less powerful, and so their flight was clumsy and more difficult. All but newborn Brainstealers (if they were newborn at the time of their ceremorphosis) were capable of telepathic communication.

Depending on their stage of development, they hold all conventional Illithid psionics, capable of detecting thoughts, levitation, shifting between planes, and charming their enemies.