ThurrOm was the name given by Erasmus to the Omnius gelsphere copy brought to Corrin from Wallach IX by Yorek Thurr during the Great Purge. In order to keep his devious activities secret, this incarnation of Omnius had been tampered with by Thurr while on Wallach IX. Omnius was reluctant to be updated with these last two gelspheres (the other being SeurOm), fearing that they would be corrupted by some virus, like the one programmed by Vorian Atreides years ago. The independent robot Erasmus gave the name "ThurrOm" to tell the difference between that copy and the other copy, "SeurOm", on Corrin.