The Empire gave the Thaarke Corporation control of the Geddis mine on Prakith. The mine had previously been ran by Myrum Geddis and he disliked the Thaarke Corporation for taking it away from him, although many people believed that the Corporation ran the mine more efficiently.
The Corporation bored into an underground cave network that was home to the Stereb. They enslaved a number of them and forced them to work in the Geddis mine. However, they kept the existence of the Stereb a secret to give the Corporation an advantage over its competitors.