Kabr was a Titan who hunted the Vault of Glass, inspired by Osiris. He gathered a fireteam, including the Warlock Praedyth, and entered the Vault. His entire team died, and Praedyth was stuck in a time loop by Oracles. Kabr went insane after realizing he lost fireteam members that no one remembered existing. He learned the secrets of the Vault, telling some to Pahanin. Pahanin became frightened, and built SGA. Kabr knew he was infected by thought-based Vex, so as his last actions as a Guardian, he pierced the Vault and built the Aegis from his own Light and the thinking flesh of a Gorgon