Warrens

Warrens is the UNSC codename for a location on the Forerunner Shield World of Requiem. It is a Forerunner structure built into a large cavern.

History
During the Requiem campaign in February 2558, Jul 'Mdama's reformed Covenant faction had created a small outpost in the Warrens. After recovering data from another Covenant outpost, the sent Fireteam Crimson to infiltrate the facility. Crimson managed to force their way into the facility, but were ambushed by a group of Promethean Knights. The Spartans eliminated all hostiles in the and hacked a local computer. Crimson learned about a Covenant archaeological dig in progress, and, with this information, Fireteam Crimson were evacuated from the Warrens.

Later in the campaign, Fireteam Lancer discovered that the Covenant had resettled the Warrens and a new Covenant base had been created. Lancer and Crimson regrouped and attacked the base together. However, a shield wall blocked the Spartan's access to the Warrens, and the generators powering the walls were camouflaged. After eliminating the Sangheili that was controlling the clocked generators, they destroyed the now exposed shield generators, bringing the shield wall down. Crimson and Lancer made their way into the base and clear all the of Covenant forces around the base. The Spartans ventured into the caves of the Warrens, where they detect an SOS signal that is being broadcasted from inside the cave system. While searching the caves, the Spartans come across a Forerunner structure and they eliminate the Covenant and Promethean forces protecting it. Inside the structure, Crimson came across Fireteam Switchback - who had gone missing while trying to disrupt a Covenant excavation - trapped behind a shield wall. Crimson rescued Switchback and, after eliminating remaining hostiles, the three fireteams are picked up in a Pelican.

Unable to drop Crimson off at Apex due to heavy Covenant resistance, the fireteam was deployed at the Warrens where Spartan Jared Miller believed there was a path to Apex through the caves. As Crimson eliminated Covenant and Promethean forces throughout the Warrens, they began to experience tremors from Requiem breaking apart. Eventually, the Spartans made it to Apex. Later, Fireteam Crimson passed through the Warrens with a Type-56 Lich's engine core. The Spartans salvaged several vehicles along the way, and eventually a Pelican picked them up. The Warrens were eventually destroyed when Requiem was sent on a collision course with its star.

Trivia
A warren is a series of interconnected tunnels used by rabbits.

List of appearances

 * Halo 4
 * Spartan Ops