The Cave of Truth, situated on Teya IV, served as an assessment site. Its purpose was to challenge young Jedi apprentices, evaluating their capacity to manage fear, impatience, anger, and physical endurance. For more than six centuries, Willm Lywin acted as the cave's custodian, guiding pupils through its trials. During the Great Sith War, Vici Ramunee successfully navigated the cave as an element of her training at the Teyan Praxeum.