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"Guys, that sounded like there were dozens of em'. Hundreds. Like a... like a swarm."
Delmont Walker to Kait Diaz and JD Fenix, after an attack on their village

The Swarm War, also called the Swarm Outbreak[1] was a planet-wide conflict between the Seran and Swarm races. The conflict began on 42 A.E., twenty-five years after the end of the Locust War. On Victory Day, the late Professor Adam Fenix activated the Imulsion Countermeasure Weapon, which was a targeted-radiation device, aimed at destroying living cells infected with Imulsion. The weapon vaporized the Lambent race and destroyed Imulsion while all Locust creatures collapsed and began to develop an impenetrable Imulsion crystal shell around their body. Unable to destroy the bodies, the surviving humans disposed of the Locust by dumping them underground in the mass burial sites. Around 42 A.E., the Imulsion crystal shells hatched and the evolved forms of the Locust known as Scions emerged. In order to rebuild their army and finish destroying humanity and colonizing the surface, the Scions created the Swarm, a hivemind of creatures controlled by the Scions. The Swarm harvested all living organisms including humans and transformed them into soldiers for the Swarm army. The newly reformed COG and Outsiders began noticing the disappearances on both sides and discovered that their people were being taken and transformed by the Swarm, initiating the Swarm War.


The origins of the Swarm coincided with the origins of the Locust Horde during the early Pendulum War-era. In an effort to cure Rustlung, Dr. Niles Samson created the Locust Horde by combining the embryonic stem cells of Myrrah, a woman born with a genetic immunity to Imulsion, and the DNA of the Sires, mutated humans sick with Rustlung and spliced from the DNA of Hollow Creatures by Dr. Niles Samson at the New Hope Research Facility. Due to unknown reasons, all Locust specimens and Myrrah were connected psychologically, known as the Hivemind, with Myrrah able to control the Locust.

During their work at the Mount Kadar Laboratory, Niles Samson then genetically designed the Locust to be able to quickly evolve in order to withstand generational conflict by hibernating and metamorphosing. Meanwhile, Myrrah had sexual relations with a scientist, Dr. Torres, and gave birth to a female human child named Reyna, who had inherited her mother's connection to the Hivemind. However, Dr. Torres feared the experimentation that would be done to his daughter and thus escaped the facility with Reyna. Unable to recapture them, Niles Samson lied to Myrrah that Reyna was killed in the escape attempt.

In her grief, Myrrah grew a hatred of the humans and took control of the Locust to slaughter all the scientists in the lab before escaping. Becoming their leader, now Queen Myrrah led the Locust deeper into the caverns of Mount Kadar and built their own civilization: Nexus. In time, however, the Imulsion began to infect the Locust, known as Lambency and began a conflict between the Locust and their infected brethren. Queen Myrrah sought the help of human scientist, Professor Adam Fenix, to cure the Lambent. When he was unable to do so, Queen Myrrah led the Locust to invade the surface in order to destroy humanity and colonize the surface to escape the Lambent.

In 17 A.E., Adam Fenix was successful in creating the Imulsion Countermeasure Weapon. Biological countermeasures could not work against the Lambent as the Imulsion would infect or evolve against it. Adam also couldn't avoid sparing the Locust from being harmed because of their ancestors being the product of Imulsion experimentation, which then resided in Locust DNA. After launching the Countermeasure, however, the Locust did not vaporize like the Lambent. Instead, the Imulsion in their DNA emerged and crystallized from their skin, forming a cocoon over their bodies - as they were designed to survive and evolve against such measures. The humans were unable to destroy the crystallized bodies, and ultimately decided to bury the Locust in mass graves.


Rebuilding the Army (42 A.E.)Edit

In 42 A.E., the Locust shells placed in the mass graves began to hatch. Emerged were evolved Locust Drones now calling themselves Scions. Since their hibernation, however, humanity had rebuilt and grown substantially, and began using automation, called DeeBees, for their defense. Realizing they were low in numbers, the Scions created a bio-organism later called the Swarm. They began to build Hives from their burial sites and created creatures known as Snatchers to capture humans and place them in Pods within the Swarm Hive. There, they would transform into soldiers for the Swarm - birthed as Juvies and later growing into Drones for the Swarm Army.

Among the humans were two factions: the rebuilt Coalition of Ordered Governments, and the Outsiders, a group formed from the Stranded who resent the Coalition and chose to live outside of COG jurisdiction. The Swarm, led by the Scions, began to capture humans from both sides. This, in turn, fueled the Outsider Movement, a conflict between the two factions - believing the other to have been kidnapping their people. While the Swarm continued to build their army, the Scions realized they lacked a physical Queen - as a Queen is needed for the Swarm to learn and grow. Unknown to humans, while Myrrah was killed by Sgt. Marcus Fenix, her consciousness survived within the Hivemind - allowing her to potentially lead again, but would need a physical vessel.

Due to their connection, Myrrah then discovered that her daughter, Reyna, actually survived and was the leader of an Outsider Village - Fort Umson. She then commanded the de-facto leader, the Speaker, to ambush Fort Umson and capture Reyna alive. The Speaker was able to capture Reyna and brought her to the Swarm Hive located within the Tollen Dam. In the heart of the Hive, Reyna was connected to the Swarm physically - as she was to be transformed into Myrrah's physical vessel as Queen of the Swarm. They also made sure that premature disconnection would ultimately kill Reyna. However, her daughter, Kait Diaz, led a rescue mission accompanied by her friends and the Coalition of Ordered Governments - but was too late. Reyna had already begun transforming, but was able to be disconnected by Kait. The Swarm recovered her body and continued to transform her, but also began to set their sights on the next in line: Kait Diaz.

Emergence of the Swarm (42 A.E.)Edit

The survivors of Fort Umson: Kait Diaz, James Dominic Fenix, and Delmont Walker, returned to the Coalition in order to inform First Minister Mina Jinn about their new enemy in an intelligence summit. However, First Minister Jinn debated with Marcus Fenix and Damon Baird on the necessity of reactivating the Hammer of Dawn - as First Minister Jinn was against it due to being a survivor of the Hammer of Dawn Strikes. However, Fenix and Baird led a mission to Azura to launch a Hammer of Dawn satellite. Meanwhile, the Swarm began to emerge and their presence became known to the public as they launched their attack on Settlement 2.

Coalition forces and DeeBees were brought to Settlement 2 to evacuate the civilians and fight the Swarm. During the battle, it was discovered that the Swarm could hijack the DeeBees and use them against the humans. The overall forces overwhelmed the COG and forced them to abandon Settlement 2. Before the last of the Coalition abandoned the Settlement, James Fenix attempted to rescue an evac convoy being attacked by the Swarm by using the relaunched Hammer of Dawn. It was successful in killing the Swarm forces, but then went unstable and began firing wildly - killing many civilians, Gears, and injuring James himself. The Coalition then pulled out of Settlement 2 and began to fortify the rest of the Settlements and New Ephyra.

COG-Outsider Armistice (42 A.E.)Edit

Hammer of Dawn Counterattack (42 A.E.)Edit

Hivebuster Offensive (42 A.E.)Edit


  1. Gears 5: Kait Diaz's dialogue with Delmont Walker while Skiff riding in Act II
Battles of the Swarm War
42 A.E. Rescue of Fort Umson (Ambush on Fort Umson · Mission to Fort Reval · Battle of Osmium Mine Bravo · Mission to the Tollen Dam · Skirmish in Speyer · Assault on the Tollen Dam) · Skirmish in the Wilds · Ambush of South Village · Mission to Fort Umson · Mission to Orzabal Crater · Mission to South Village · Mission to Azura Research Facility · Evacuation of Settlement 2 · Ambush on Croya · Ambush on Bravelle · Siege of Riftworm Village · Second Mission to New Hope Research Facility · Incursions in Kadar Valley · Mission to Mount Kadar Laboratory · Mission to OZP-11 · Battle of Old Ephyra · Hivebuster Offensive (Hivebust of Pahanu Island · Mission to Croya · Hivebust of Bravelle)

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