Vale Citadel

Librarian's Rest was a location inside the Forerunner shield world Requiem. The Forerunner structure was situated near the area codenamed "Sniper Alley". It hosted a shrine inholding the Librarian's imprint and later became a major emplacement in the conflict opposing the United Nations Space Command to the reformed Covenant.

History
Six months after First Battle of Requiem, Jul 'Mdama's Covenant forces occupied the Librarian's Rest, but were able to enter the shrine located on the site. With the aid of a Forerunner artifact which was brought onboard the UNSC Infinity by its crew, 'Mdama managed to abduct Dr. Henry Glassman. The Covenant forced him to work on opening the shrine. They believed that the Librarian would gift them incredible bounties spread throughout the galaxy, such as weapons and ships. Despite not having adequate equipment, Dr. Glassman managed to activate the shrine. While all the Sangheili were captivated by the shrine, Dr. Glassman managed to secretly escape the room.

Jul 'Mdama communicated with Dr. Catherine Halsey in order to seek her help with unlocking the secrets of the shrine. He mounted an attack on the UNSC Infinity with the primary objective to abduct Dr. Halsey. Halsey used her data pad to deactivate the protective shield and unlock the shrine, then quickly ran into the shrine before 'Mdama. Inside the shrine, Dr. Halsey met the Librarian's imprint who welcomed her and showed her the two halves of the Janus Key and their functionality. When taking the key, Halsey was subsequently expulsed of the shrine.

During Halsey's conversation with the Librarian, Jul 'Mdama ordered all his troops to meet at Librarian's Rest. This communication was intercepted by Fireteam Crimson when they were on a mission to search for the source of communications Halsey had been relaying at Cyclone. Both Roland and Dr. Truman were unfamiliar with it, but Truman managed to decrypt Halsey's communication stream with the external aid of the Librarian. The UNSC would only be able to hear part of the conversation, namely "to the Absolute Record". The UNSC eventually managed to locate Librarian's Rest. Commander Palmer set course for the Forerunner structure with the mission to assassinate Halsey, while Captain Lasky ordered Fireteam Majestic to rescue the doctor from the Covenant. At the entrance of Librarian's Rest, Fireteam Majestic clashed with Sangheili Storm while Thorne managed to enter the structure. Inside, Dr. Halsey had been expulsed of the shrine with the halves of the Janus Key in hands. Jul 'Mdama took the red half, unaware of the blue half's existence. Thorne entered the room cloaked and killed a Sangheili. 'Mdama subsequently reached for Halsey, ordering his troops to kill the intruder. The doctor managed to toss her half of the Janus Key to Thorne, who caught it. Palmer entered the room, fighting the Covenant. Promethean Knights appeared on 'Mdama's order. Palmer tried to aim for Halsey but only managed to shoot the doctor in the shoulder. The rest of Majestic arrived in the room and a fight ensued between the Spartans and the Prometheans. Thorne and Palmer ran for 'Mdama, but the Sangheili managed to escape with a wounded Dr. Halsey as a Knight appeared and translocated them away. As all the enemies at Librarian's Rest were either dead or gone and the mission was a failure, the Spartans left the structure after discussing their contradictory objectives.

As the Librarian had predicted it to Halsey inside the shrine, Requiem was set on a collision course with its sun by Jul 'Mdama, who thought he had obtained what he wanted and was willing to sacrifice the shield world in order to eliminate the humans. However, the Infinity narrowly managed to escape its destruction and both the UNSC and the Covenant eventually ended up with a half of the Janus Key. Librarian's Rest and the shrine containing the Librarian's imprint were destroyed alongside Requiem when the shield world collided with its sun, Epoloch.

List of appearances

 * Halo 4
 * Spartan Ops