The Vore were a species that originated from the Shoal. (EDA: The Gallifrey Chronicles)
Biology
The Vore were large insects, with mandibles and legs sharp enough and powerful enough to tunnel through rock. They had large, bulbous bodies and tiny heads. Their bodies were asymmetrical, with silver carapaces and black hairs protruding through the gaps. They stood on their hind legs and were roughly the size of a Human male; their two front pairs of legs were shorter, and all of their legs were moulded into vicious spikes, sharpened curves, and hooks.
The Vore fed on temporal cicatrixes, scars where space-time had tried and failed to heal itself. They could move through the fifth dimension by manipulating hyperspace corridors.
The Vore communicated using gestures and chemical signals. They had no individual intelligence and acted on instinct and transformed the life of planets they invade into chyme (vomit), which they used to grow the fungus on which they fed. (EDA: The Gallifrey Chronicles)
History
Marnal was the first Time Lord to make contact with the Vore, when he and two other Time Lords visited the Shoal to destroy a temporal anomaly.
After Marnal's mission to contact the Vore, the High Council made an order which stated that "no Time Lord is to engage the Vore and to observe an exclusion zone no less than one parsec and one century in all directions from any Vore moon". (EDA: The Gallifrey Chronicles)