Quoth

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The Quoth were a subatomic sentient species, no larger than a string of quarks. They had the power to alter matter. (PROSE: So Vile a Sin)

They lived at least eighteen thousand times faster than a human. Their original homeworld was a spinning cylinder of neutronium, a light-day long, whose rotation distorted time. When the cylinder was destroyed (PROSE: The Death of Art) by an N-Form, (PROSE: Damaged Goods) the Quoth drifted through space until they encountered Earth. (PROSE: The Death of Art)

There, they found the only source for their birthing materials was inside the human brain, created as a side-effect of psionics. Ironically, the extraction process stimulated the psychic nodes in the host's brain, increasing their psionic ability.

Once freed from Montague's enslavement, the Seventh Doctor took them to a new home, the neutronium remains of a first-generation star at the galactic core. (PROSE: The Death of Art)