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The Psychneuein is a warp creature similar to a large wasp.1 These creatures are sensitive to the presence of a Psyker, and reproduce by planting eggs in the brain of the Psyker, if allowed to do so. Once infected, the Psyker slowly loses intelligence and their appearance slowly changes until they either are killed, or suffer from the Perils of the Warp - upon which multiple Psychneuein will erupt from the corpse. Psychneuein have three well-known phases - the larval phase, the adult phase and the "infected" phase. 2

Larval Psychneuein are typically puny creatures, whose main strength is their ability to infect others. When damaged but not killed by a weapon, or particularly vicious blow, they have a chance of manifesting into the adult form. Other than their small size, they tend to be very easy to kill, but occur in large numbers - making an infestation of Psychneuein dangerous, particularly if there are any latent Psykers around for them to infect.2

Adult Psychneuein are much more dangerous than their larval brethren - stronger and far, far tougher than your average human, they're quicker, more intelligent, more perceptive... and that's without taking their psychic powers or the ability to fly into account. They may become insubstantial at will and may detect not just the presence of Psykers, but any nearby sentient being. In short, they are very, very deadly.2

Once hatched and having killed the victim, the creatures will grow to become large meat eating predators.1

The original homeworld of the Thousand Sons, Prospero, was subject to a massive infestation of Psychneuein, which almost caused the downfall of civilisation there until the inhabitants learned to control their psychic abilities. Even then, swarms of Psychneuein still haunted the wilderness and the ruins of ancient cities.3