Gricha
one of the many creatures bio-engineered by the Yuuzhan Vong, the gricha grow in insect-like stages. As larva, the gricha are capable of consuming sand and other silicates and excreting a form of nacreous shell. As they eat their way to adulthood, the gricha form structures with their shells that are eventually used by the Yuuzhan Vong as dwellings or storage areas. Larger buildings, like the grashal, can be formed by a large number of gricha in a short time.
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