These giant wormlike beasts feed on metal minerals and crushed limestone. They are attracted to energy-emitting devices, vehicles, and structures because they perceive it solely as a source of nutrients.
Hornogs had had an opportunity to face a Surdvar on a planet they had dubbed Uniib. The conflict began by tremendous roar of the ground and intense earthquakes. Then, the mountain opened up, and the Surdvar slithered out allured by the tachyon-emitting spaceships. One spaceship tasted great. The others fled and never returned to that world.