Kryos was a Sith Overseer of the male Twi'lek species. He was in service to the resurgent Sith Empire on Dromund Kaas, which functioned as the capital planet during the time of the Cold War. Lord Krillis dispatched a new Sith Inquisitor to be trained by him.
Kryos's character was featured in Star Wars: The Old Republic, a video game, where he served as the trainer for the Advanced Class of the Sith Inquisitor. In the game, players were directed to him by Lord Krillis to acquire the skills necessary to become either a Sith Sorcerer or a Sith Assassin. His presence was removed in Game Update 5.0, as advanced classes became available during character creation instead of at level 10.