Though their technologies were relatively unsophisticated (approximately equal to those of late Agricultural Age or early Industrial Age humans on Old Earth) baseline To'ul'hs had already been a civilized species for ten times as long as the entire history of the Terragens when they were contacted. The To'ul'h and their civilizations were found only after probes were sent to the planet's surface to explore the peculiar biology of Tohul's pressure-cooker surface life. Because of their environment the To'ul'hs had never developed the kind of technology that would have led to electromagnetic emissions or orbital settlements, and To'ul'h cities and the extensive but subtle To'ul'h agricultural works were not evident beneath the thick layers of clouds and airborne life of their homeworld. Tohul had been noted as a life-bearing world more than a millennium beforehand, and at least one preliminary expedition to the To'ul'h's home system (H'tat'sa'thoss) had examined its planets from orbit, but the To'ul'h civilization was not apparent except at closer range. When they were belatedly discovered in 3831 AT beneath the clouds of their home world they were a surprise, and in some quarters a disappointment, because of their relatively low level of technology. They were the first xenosophonts to come into direct contact with Terragens.

Introduction The To'ul'hs are an intelligent, flying species with an origin on a hot wet greenhouse world many are now closely integrated into the Terragen civilizations. To'ul'hs are a flying sophont race from the wet greenhouse world of Tohul

Hhhh civilizations