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A Kryllstorm commenses as twilight approaches in Ephyra.

"Relax, Lieutenant. Still hours before the damn Kryllstorm hits the city."
—Cpl. Michael Barrick to Lt. Minh Young Kim during the Evacuation of Ilima in 9 A.E.

Kryllstorms were a phenomena created by the Locust Horde to occupy Seran cities. During the Locust War, the Locust Horde would use Seeders to fill the skies with Nemacysts to dispel ink in order to prematurely launch the Kryll, ravenous bat-like creatures that were sensitive to UV light, in the daylight - allowing the Locust to eradicate nearly all human life and occupy the city much faster.

Their destruction was so vast and indiscriminate, that the COG would force mass evacuations of human settlements before night comes. Kryllstorms would cease to exist as a 'weather' phenomenon following the extinction of the Kryll during the Lightmass Offensive.


Destruction of Halvo Bay[]

A Kryllstorm was mentioned by Gears during the Destruction of Halvo Bay. However, despite this, no Kryllstorm was seen by Lt. Damon Baird's Kilo Squad at Halvo Bay. This may suggest that the Kryllstorm was only found at the outskirts of Halvo Bay. On the other hand, it was possible that the fires spawned from the fighting as well as the impact of the Lightmass Missile put a premature end to any storm taking place.[1]

Evacuation of Ilima[]

During the Evacuation of Ilima, the COG ordered a city-wide evacuation over a predicted Kryllstorm. However, four hours before the estimation, the Locust Horde led by General RAAM emerged and started to blanket the city in ink via Seeders and Tremors, which initiated a premature Kryllstorm.[2]

Bombing of Timgad Valley[]

In the Lightmass Offensive, Delta Squad encountered a Kryllstorm at the "New Ephyra" Outpost in Ephyra. Marcus Fenix and Dominic Santiago managed to fight their way through Locust forces and evade the Kryll by either staying under streetlights and lit rooms, or blowing up Propane Tanks to create fire.[3] At Ephyra, Delta Squad's main mission was to gain a vehicle and travel to the Lethia Imulsion Facility, in order to set up the Sonic Resonator and map out the Hollows for the Lightmass Bomb.[4]

While the Resonator failed, it turns out that the Geobots already has a far more accurate map data and with it, the Lightmass Offensive was underway. After defeating RAAM on the Tyro Pillar, The Lightmass Bomb was activated and followed the coordinates; detonating and wiping out the Kryll breeding grounds at Timgad Valley. With the extinction of the Kryll, Kryllstorms officially cease to exist.[5]

Known Kryllstorms[]