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The Prometheans are powerful mechanical warriors, and the main antagonistic force in The Reclaimer Saga of the Halo series (Halo 4, Halo 5, Halo Wars 2, Halo Infinite) replacing the Covenant. They were led by The Didact. They were once Forerunners, and later humans, but during a conflict with The Flood, they were converted to digital intelligence by the Didact via a device called the Composer.
The title of Promethiean was used to describe an entire elite faction within the Forerunners' Warrior-Servant caste, but with the extinction of the race the title was inherited by the remaining automated forces.
Promethian Soldiers and Crawlers, originaly known as Armigers are Forerunner combat drones invented by the Didact for boarding action and raids in the Human-Forerunner war. Most armigers were destroyed in the Forerunner-Food war or corrupted by the logic plauge. However, some were left to guard key Forerunner sites such as the lesser Arc and survived to the events of the Halo series. Many Crawlers were stationed with the Promethians on Requiem.
The Composer was a device designed to bridge the physical and digital realms. However, attempts to return biological beings to their original state were unsucessfull. Neverthesess, the technology would continue to be appllied for convering organics into digital form for various purpouses such as storing and transfering memories and creating AIs. During the Forerunner-Flood War, the Ur-Didact recruited an army of loyal Promethian volunteers to be composed and become the first Knights, making him immune to Flood infection. Although the digitized army proved an effective force against the Flood, their small numbers made no differece in the war at large. Desperate to create a larger army, and in an act of personal vengance, the Didact forcibly composed most of the surving human population to create the vast majority of existing Knights. Before he could wield this army, The Didact's wife, the Librarian captured and imprisoned him on the Requim. She reprogramed the Knights to guard his resting place on the Sheild World until he was ready to be awakened. Watcher Sentinels seem to have been developed in conjunction with Knights to support them in battle.
Promethian Soldiers were first encountered by the major species of Halo on the Lesser Ark in 2555, when the caretaker of the Installation 000 Tragic Solitude used them, as well as the instalation's wildlife to fight off a Human-Sanghili task force sent to disable the Halo array. The remaining forms would be encountered July 2557, when John-117 and Cortana came across Requiem while drifting in the UNSC ship, Forward Unto Dawn. They and a Storm Covenant force were forcibly pulled into Requiem and crashed on the surface. They then encountered and fought the Promethean constructs inhabiting the shield world. The Didact immediately took control of the Prometheans after he was accidentally awakened by John-117. He also aloited controll of the Promethians to the Covenant leader Jul Mdama.
Bent on preventing humanity's ascendance to the Mantle in the Forerunners' place, The Didact imediately retrieved the Composer from Halo instalation 03 and then moved to wipe out humanity at Earth. Master Chief and Cortana were able stop the Didact and destroy both the Composer and his ship Mantle's Approach as well as any Promethians stationed onboard, but not before the Composer was used on the city of New Phoenix, digitizing its entire population. The composed escencess were transfered back to requiem to await their conversion. The storage unit containing the composed humans was retrieved by the UNSC several months later in February 2558.
Promethean constructs continued to battle the UNSC forces alongside Jul Mdama's Covenant for as long as the next 8 months. In this period of time during a battle on the planet Oban, the Knights, as well as many of the Promethian weapons underwent a mutation which changed their structure and combat capabilities signifigantly. It is belived this was an adaptation to non-flood combatants. By October of 2558 the Promethians had fallen under the control of Cortana and The Warden Eternal, becoming the footsoldiers of the AI lead faction, The Created. They would attack any persons near the Guardians regardless of hostility.
Cortana was not able to take control of the Armigers and Sentinels on the Lesser Ark due to precautionary measures from human elements stationed there. The Armigers on the Ark have remained inactive and have not been encountered since the skirmish in 2555.
- Knight Lancer
- Knight Commander
- Knight Battlewagon
- Knight Bannerman
- Knight Luminary
- Crawler Snipe
- Crawler Prime
- Soldier Captain
- Soldier Sniper
- Hydra Soldier