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"We were there at ground zero. All of us at Timgad, we saw the Lightmass bomb. It was something you never forget... hard to even describe. Another Gear, he said it was like seeing God screaming at creation. Bout as best as you could say it."
—Sgt. Jonathan Harper after the bombing

The Lightmass Offensive, also known as the Lightmass Bombing or Timgad bombing was a COG operation to destroy a significant proportion of the Locust forces in the hopes of ending the war once and for all. Taking place in Ephyra City, Lethia Imulsion Facility and the Outer Hollow, the objective of the mission was to deploy the Lightmass Bomb. It was hoped that this would destroy the Locust Horde and end the 14 years of war. The operation was to be carried out in two phases: The deployment of the Sonic Resonator to map the tunnels and provide targeting data for the bomb and the actual delivery and detonation of the bomb itself.


The Slab[]

Since the fall of Ephyra and Landown, the Locust forces were scattered around the Plateau and with the great loss of human life in the 14 years of war, Colonel Hoffman was forced to get fresh new recruits from the infirm, the young and the irredeemable. Hoffman pardoned numerous criminals of all different kinds, but left Marcus Fenix to the Locust that were storming 'The Slab' (Jacinto Maximum Security Prison). Lucky for Marcus, Dominic Santiago came to rescue him from the prison and the Locust Horde and enrolled him in Delta Squad.

Order of Battle[]

Assault on Alpha Squad[]

In the opening shots of the Lightmass Offensive, Alpha Squad and the other squads was taking heavy casualties and running into heavy resistance from the entrenched Locust forces in the city of Ephyra. While Alpha and Sgt. Kennel’s squad were dealing with the Locust Horde, Col. Victor Hoffman was on his own mission.

Rescue Mission in Ephyra[]

Coalition forces took heavily losses during the opening hours of the offensive.

Delta Squad was personally ordered by Hoffman to relocate the Resonator and give support to Alpha Squad. Delta Squad moved on the House of Sovereigns, the last known location of Alpha. Delta proceeded to eliminate several Locust hard points on the road to the House of Sovereigns. However, during one fight, Pvt. Anthony Carmine was killed by a Locust sniper. Regardless of the casualty, Delta advanced into the House where they came across Pvt.Augustus Cole and moved on to take the Seeders out that are blocking communications with High Command. Alpha Squad and the Resonator are recovered. However, the King Raven that was coming to extract the squads was shot down in an ambush by a horde of Drones led personally by General RAAM. Lt. Minh Young Kim and several Gears were lost in the attack and the subsequent arrival of the Berserker. The Berserker was killed by Fenix with the Hammer of Dawn and Fenix was promoted to Sergeant to replace Kim as the leader of Delta Squad which was now made up of Sergeant Marcus Fenix, Private Dominic Santiago and the two survivors of Alpha Squad, Privates Augustus Cole and Damon Baird.

Transport to Lethia[]

A newly promoted Sergeant Fenix was charged to lead Delta Squad, now consisting of Fenix, Santiago, Baird and Cole to the Lethia Imulsion Facility and activate the Resonator to map the Hollow. As it would soon be dark and the Kryll would come out, it would be too dangerous to travel the 10 kilometer distance on foot. However, Private Dominic Santiago had a friend among the nearby Stranded named Franklin Tsoko who owned a Junker and owed him a favor. Traveling to the Stranded outpost, Delta encountered heavy Locust opposition, but managed to push through it to the outpost where Franklin reluctantly agreed to let them borrow his Junker and sent Dom and Marcus to Aspho Gas Station where it was located while Baird and Cole had to remain behind to help defend the outpost. Making their way to the gas station, Marcus and Dom were forced to stay in the light for protection, blowing several propane canisters up to do so after the Kryll came out. The first Stranded checkpoint was destroyed by the Kryll once they lost their light and the men manning it were killed. Finally, after more heavy opposition including snipers and Troikas, Dom and Marcus made it to the gas station only to find out that Chaps, the Stranded manning it hadn't filled the Junker up with Imulsion as he didn't believe that they would make it. As the Junker was filled, the two Gears and the Stranded were forced to defend the station from a massive Locust attack. Once it was repelled, they fled in the Junker, running over a Boomer and causing it to accidentally blow the station up. After fighting the Kryll off all the way back to the Stranded outpost, the reunited Delta was forced to help the Stranded fight a massive attack off on the outpost by a variety of Locust forces. Once the attack was repelled, Delta left in the Junker and made it to the outskirts of the Imulsion Facility without further issues, but the Junker broke down once they got there and they couldn't fix it without new parts and they abandoned it.

Lethia Imulsion Facility[]

Arriving at the facility, Delta found the Lambent Wretches along with the other types of Locust present. As the pumping station lift was off-line, they couldn't make their way directly to where they had to deploy the Sonic Resonator and would have to fight their way through the facility to the mines and the Outer Hollow to get to the station. After having to find an alternate way into the facility as the front door was locked too tightly for them to enter, they found themselves facing several packs of Lambent Wretches and Locust. With the help of a Stranded who was killed by the Lambent Wretches, Delta found their way to the mine carts and were able to get close to the mines, using lift platforms to get down into them after killing the two Boomers.

Needing to protect the Resonator, Delta split into two teams: Dom and Marcus went ahead while Cole and Baird stayed behind to protect the Resonator. After Marcus and Dom fell down a hole, Baird and Cole were forced to start searching for their own way to the Lethia Imulsion Facility's pumping station where they were to deploy the Resonator. Fighting their way through the Hollow, Dom and Marcus encountered all kinds of Locust and more packs of Lambent Wretches, but managed to push through them by getting close to the pumping station before finding out that a Corpser was stalking them. Marcus and Dom managed to drop the Corpser into a pool of Imulsion, killing it and reunited with the rest of Delta Squad. Reaching the pumping station, they found it heavily protected by a variety of Locust including Theron Guards. Attacking from both sides, Delta managed to take the Locust out and deploy the Resonator, using the pumping station lift to reach the surface once more. As Delta fled the Lethia Imulsion Facility, the Resonator detonated. As Delta believed that they succeeded in getting the data needed to launch the Lightmass Bomb, they learned that the Resonator failed as the Hollow was just too large. Baird found map data on the Hollow on a geobot that he picked up along the way and suggested that they should use that data instead. Studying the geobot data, Lieutenant Anya Stroud determined that the portion that the geobot showed alone was more than the Resonator got and determined that the location that all of the data was stored at was the East Barricade Academy, more specifically the Fenix Estate. Needing the data, Colonel Hoffman redirected Delta to East Barricade to retrieve Adam Fenix's data. Unknown to everyone, General RAAM overheard the whole conversation on a captured Gear's radio and diverted the forces to stop Delta from succeeding.

East Barricade Academy[]

As Delta headed to East Barricade Academy on a King Raven to get Adam Fenix's data on the Hollow, KR Two-Five was shot down by the Nemacysts and Delta was forced to land under heavy fire in a plaza and continue on foot from there. After eliminating all of the Locust in the plaza, Delta split up to continue, taking the Seeder out who shot KR Two-Five down with the Hammer of Dawn. Fighting through heavy Locust resistance determined to keep them from getting to the Fenix Estate, Delta eventually reunited near the downed King Raven and kept the Stranded scavengers from taking supplies from the crash site. Securing the site, Cole and Baird remained behind to wait for the injured crew and Gears to be rescued while Marcus and Dom continued on to the Fenix Estate. Dom and Marcus kept fighting through the Locust to reach the Fenix Estate, killing a Berserker with the Hammer of Dawn along the way. Finally, after heavy resistance, the two reached the steps to the Estate and had to fight through the entrenched Locust to reach the house itself which they learned from Lieutenant Anya Stroud had Locust tunnels inside and was infested with Locust. Reuniting with Cole and Baird outside the house, Marcus and Dom learned that there was a non-working APC in the back of the house that they could use for a quick escape if Baird could fix it. Assigning Baird to do that, Marcus and Dom assaulted the house itself, fighting through the Locust forces to the basement. Finally locating the door to Adam Fenix's secret laboratory in the basement, Marcus and Dom were forced to hold more Locust forces off as JACK cut through the door to the lab. Finally, all of the Locust attacking the basement were dead and the two members of Delta Squad and JACK were able to enter the lab where they found the tunnel data. Anya determined from it to her shock that the Hollow was a honeycomb and more spread out than anticipated, but the data was more than enough for the Lightmass Bomb. As there was too much data for Anya to download remotely, Marcus ordered JACK to download the data directly to his systems so they could just take it with them. As it would take time, Delta would have to defend the house from the Locust attacks. Fighting their way back to the second floor of the main room, Marcus and Dom met up with Baird and Cole who successfully repaired the APC. Baird and Cole left to defend the APC while Marcus and Dom had to fight a massive frontal assault off on the house. Finally repelling it, Marcus and Dom were called to the back of the house where the Locust were attacking as well. After fighting through to the outside, they received word from Anya that JACK managed to download all of the data and Delta made a quick getaway in the APC, narrowly escaping from a Brumak.


"Man, you sounded just like your old man back there."
"Yeah, well screw my old man. He thought he could prevent this war, and look what happened."
"Yeah, well, now his mapping data's gonna help end it.
—Dom Santiago and Marcus Fenix[10]

After a fast escape from a Brumak, Delta runs into the Timgad Bridge only to find the draw bridge open. Delta spits up to find a way to get the power on by entering Nassar Memorial Park, only to find out that the power lines are being diverted from the Bridge. After being chased by the Brumak across East Timgad, they get a distress call from Anya that the Train's commander is under attack, but the Seeder jams kick in and Delta is cut off. After finding the Location of Timgad Central Energy, Delta discovers that the Stranded are not stealing the power from the Plant, but the Locust are sending power back into the Hollows and the Train was overrun and all survivors are thrown onto the tracks.

Echo-6 watch as Tyro Pillar leaves.

Deploying the Lightmass Bomb[]

Reaching Timgad Station, Delta Squad abandoned the APC and prepared to board the Tyro Pillar when it arrived, but first had to defeat the Locust forces defending the station. After a battle, Delta killed the Locust and moved to board the train as it approached the station. However, more Locust started attacking the station and while Marcus and Dom were able to jump onto the back of the train at the last moment, Baird and Cole missed it and had to catch a ride from Colonel Hoffman on a King Raven instead.

Fighting to the first train car on the train, Marcus and Dom came under attack from another Berserker and as they couldn't use the Hammer of Dawn this time, were forced to lure it to the rear of the train and detach the car, sending the Berserker tumbling to the tracks and killing it.

Fighting through the Locust forces and Lambent Wretches on their way to the front of the train to download the data to the Lightmass Bomb, Marcus and Dom were forced to use Chain Guns on the roof of one of the cars to kill the attacking Reavers. As they got closer to the front of the train, the Lambent Wretches worked to cut the power and separate the cars to strand them away from the Lightmass Bomb.

Just in time, Marcus and Dom managed to reach the car ahead of where the Lambent Wretches were attempting this and continue their journey. Finally, Marcus and Dom managed to fight their way to the front of the train where they discovered that General RAAM himself was guarding the Lightmass Bomb with a Kryll shield protecting him. Using explosives to drive the Kryll off for moments of time and with help from the rest of Delta and Colonel Hoffman in a King Raven using a spotlight to keep the Kryll back, Marcus and Dom managed to kill General RAAM and reach the Lightmass Bomb.

Dom boarded the King Raven while Marcus inputted the navigation data, activated the Lightmass Bomb and jumped to the King Raven at the last moment as the Tyro Pillar went off a broken bridge into a lake of Imulsion. As Marcus struggled not to fall, the Lightmass Bomb launched it's projectiles into the Outer Hollow where they detonated, destroying the Outer Hollow, a massive amount of Locust and the Kryll. At the same time, thanks to Dom and Colonel Hoffman pulling him aboard the King Raven, Marcus survived.

Battles of the Lightmass Offensive[]

Day One[]

Day Two[]


The collapsing mountains from the Lightmass Offensive.

COG Premature Victory[]

"Earlier today, your Gears successfully deployed the Lightmass bomb. We have destroyed the enemy stronghold. This war has exacted a heavy price from all of us, it has torn our world apart. But you have my word: we will rise again."
—Col. Hoffman's victory speech.

With the success of the Lightmass bombing, Coalition High Command was able to order repairs and allow many of their Gears to rest since the Locust incursions in the aftermath of the attack were low in numbers and strength. The bomb destroyed the Kryll breeding grounds and 99.9% of their population. The Eagle Newspaper reported that the COG recaptured Ephyra[11] where the Stranded were allowed to roam free in the city both day and night.[12]

However, the vaporized Imulsion led to Rust Lung in people who inhaled it.

The Horde Rebuilds[]

"They do not understand. They do not know why we wage this war. Why we cannot stop. Will not stop. Why we will fight and fight and fight. Until we win... Or we die. And we are not dead yet."
—The Locust Queen on why they never will give up.

Until the Sinking of Tollen and Montevado, the COG High Command did not realize that the Horde was still organized. The Lightmass Bomb awoke the Riftworm, a creature that the Locust revered as a deity. From the time after the Lightmass Offensive, the Locust attacked North Gate Agricultural Depot and Jilane. Kantus High Priest Skorge would use the Riftworm to destroy several COG outposts and three cities, leading to Operation: Hollow Storm.[13]


Locust War
0 A.E. Emergence Day (Emergence in Jannermont · Emergence in Mattino Junction · Emergence in Ilima · Emergence in Porta Ogari · Emergence in Ephyra · Fall of Gorasnaya · Evacuation of Mercy) · Battle of Nordesca · Battle of Kinnerlake · Destruction of Halvo Bay (Destruction of Old Town · Battle of the Museum of Military Glory · Siege of Halvo Bay Military Academy · Evacuation of Seahorse Hills · Battle of Elliott's Mansion · Raid on Onyx Point · Bombing of Downtown Halvo Bay · Ambush on the Halvo Bay Courthouse · Battle of the Plaza)
1 A.E. Battle of Kaia (Battle of Jasper · Battle of Autrin) · Battle of Bonbourg · Second Battle of Jannermont · Fall of Ostri · Battle of Andius · Ambush on Voslov Bridge · Hammer of Dawn Strikes · Assassination of Ukkon (Mission to CIC Aldair · Rescue of Echo-Five · Assault on Industrial District · Mission to Claybourne · Rescue of Alpha-Two · Mission to Nedroma Health Institute · Battle of Imtik Imulsion Rig · Mission to Winlock Outpost · Mission to the Badlands · Mission to Zenic Province · Battle of Ukkon's Laboratory) · Battle of Oblivion · Skirmish in the Live Zone
5 A.E. Fall of Landown
9 A.E. Battle of Noroa · Riverside Skirmish · Evacuation of Ilima (Ambush on Checkpoint Zeta · Assault on Ilima Savings and Trust · Mission to Ilima High School · Battle of Downtown Ilima · Battle of Dr. Wisen's Orphanage)
10 A.E. Battle of Estana · Skirmish at Shenko Falls · Fall of Ephyra
11 A.E. Skirmish Outside the Wire
12 A.E. Raid on Ginnet Drive · Incursions at Endeavor
13 A.E. Battle on the Andius Highway · West Barricade Campaign · Raid on the CIC
14 A.E. Operation: Midnight · Jilane Massacre · Siege of the Slab · Lightmass Offensive (Battle of Embry Square · Mission to House of Sovereigns · Ambush at Tomb of the Unknowns · Mission to Old Ephyra · Assault on Franklin's Outpost · Mission to Lethia Imulsion Facility · Mission to East Barricade Academy · Battle of Haldane Hall · Mission to Timgad · Battle on the Tyro Pillar) · Ambush at Sovereigns Boulevard · Evacuation of North Gate · Mission to Tollen · Battle of the Tollen Dam · Evacuation of Speyer · Evacuation of Fort Reval · Battle Outside of Jacinto · Mission to the Pirnah Badlands · Battle for Fucked · Mission to Montevado · Battle Near Jacinto · Unidentified M.O.U.T. Battle · Liberation of Jilane · Siege of Jacinto City · Operation: Hollow Storm (Battle of Stromson Forest · Assault on Landown · Assault on the Inner Hollow · Battle of Ilima · Destruction of the Riftworm · Mission to New Hope Research Facility · Assault on Mount Kadar · Siege of Nexus · Battle of the Royal Palace · Sinking of Jacinto City) · First Mission to Merrenat Naval Base · Skirmish South of Port Farrall · Second Mission to Merrenat Naval Base · Battle of Port Farrall · Ambush Outside of Port Farrall
15 A.E. Skirmish in the Kashkur Foothills
17 A.E. Skirmish at Endeavor · Siege of Azura · Victory Day (Attack on the Sovereign · Battle of Centennial Bridge · Ambush on Hanover Coast · Battle of the Deadlands · Battle of the Anvegad Plains · Battle of Anvil Gate · Mission to Halvo Bay · Skirmish in Concord · Mission to Mercy · Mission to Char · Battle of Endeavor · Incursions in the Serano Ocean · Battle of Azura)