Born on the island of Alytocs, just off the northern shores of Kaepra, the Sangheili Field Commander known as Gek 'Lhar served for decades during the Covenant's campaign against the humans, only to watch the military powerhouse crushed under the weight of the Great Schism. In 2558 Gek greeted Jul 'Mdama at the shrine of the The Librarian. Jul had brought Henry Glassman who offered assistance for his life. Gek was given the task of guarding Glassman as he worked. Gek was told that the assault on Galileo Base was a diversion to the Humans. He was later ordered to pursue Dr. Glassman and Spartan Gabriel Thorne after the former escaped. After catching up to the two humans and engaging Thorne in combat, he was shot and killed by Paul DeMarco.