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Psi-forms were creatures inhabiting the psychosphere of a planet.
Usually, Psi-forms were not directly perceptible to the matter-based inhabitants of the same planet but could influence their emotions. Special technology, such as headgear created by the Tenth Doctor, could reveal psi-forms and facilitate communication with them.
The most common psi-forms were Pranavores. On one planet, experiments on Pranavores led to the creation of psychosphere predators, Cerebravores. (COMIC: Revolutions of Terror)