Nemacysts were flying organic mortars released by the Seeder's secondary "mouth" that would make a beeline for the nearest enemy unit. It was deadly against COG Gear squads or King Ravens.
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Nemacyst were part of the attack on Halvo Bay led by General Karn. While defending the Great Hall of the Museum of Military GloryKilo Squad noticed that several Nemacyst broke inside the Hall and gave aerial support to the Locust forces on the ground, Kilo managed to take down the Nemacyst and the rest of the Locust before they headed to the East Wing.
Later in Monroe Commons (inside the the Halvo Bay Academy) several Nemacyst tracked Troy due to a signal coming from it, targeting it while it was protected from other Locust Kilo had to deal with several swarms of Nemacyst before they stopped targeting Troy.
In its last stand at the Plaza for the Tyran Dead the Shibboleth launched several Nemacyst like a Seeder would to aid it against Kilo Squad and Col. Ezra P. Loomis, the gears managed to destroy the Nemacyst and kill the Shibboleth.
When the Locust Horde took over the city of Landown , they used several Nemacyst Mortars to attack the city and its citizens, Locust forces arrived at the city, captured it and was turned into a Locust stronghold.
Nemacyst were used by General RAAM in his plan to ink the city of Ilima so it could be cleared from its human populance by a Kryllstorm and by doing so they would get closer to Ephyrato perform an attack on the city, to accomplish this RAAM summoned somebodyguards and a Tremor to summon Seeders into the city so they could use the nemacyst to ink it, as RAAM advanced many seeders were summoned and therefore hundreds of nemacyst flew over the sky inking the city,Zeta-Six watched some of them and then procceded to kill the seeders that were summoning them, they tried to fend off with nemacyst and the help of some Grapplers, but they were all defeated alongside the seeders.
As Zeta-Six exited Ilima High School they saw the sky filled with ink, with now thousands of nemacyst covering the sky so the Kryll could devour the city.
When the elites re-emerged at Alpha Squad's Evacuation Outpost they escorted the tremor to another location so it could summon another seeder, as soon as it emerged it began to launch Nemacyst, then the tremor procceded to summon other three seeders near Ilima's City Hall, as they emerged they launched more nemacyst into the air, however queen Myrrah stated that the sky wasn't dark enough and sent her troops to the last emergence point.
Zeta would later watch the area around City Hall full of Nemacyst flying in circles around the area, they would follow them to their destination and kill the Seeders htat summon them. Nemacyst eventually filled the sky with ink and completely covered the city of Ilima, however it was too late to stop the gears from escaping.
When Minh Young Kim asked for air support from Col.Victor Hoffman, he stated that they could not send air support because of Nemacysts flying over the area which kept the Ravens out of the air. Delta Squad encountered a Seeder near a bridge of a lake and attacked it with a Hammer of Dawn, though Nemacyst tried to protect it they were easily defeated by the humans, another Seeder was encountered by Delta at an open part of the building and again tried to use Nemacyst to attack the Gears but they were defeated alongside the Seeder, the last Seeder again used the Nemacyst to fend itself but they were all strucked down and the skies were almost clear. More Nemacyst attacked Alpha Squad from above, giving a tactical advantage to the Locust, but Delta One managed to destroy them using the Troikas of the rooftop, however despite having destroyed most of them two managed to take down the newly arrived Raven sent to evacuate both Delta and Alpha, leaving the Squads to fend themselves against the Horde of Locust behind them and General RAAM.
As Delta Squad was heading towards East Barricade Academy via King Raven Nemacyst took down one of the Ravens and forced the other to open fire on the Nemacyst and to land immediately. Soon they found more Nemacyst and the Seeders that had summoned them, they quickly dipatched them all with the Hammer of Dawn. More Nemacyst gave support to a Theron stationed in a rooftop but were quickly finished. More Seeders at East Timgad launched Nemacyst over the air and Delta found a rooftop full of Nemacyst but finished them quickly. When a Berserker boarded the Tyro PillarMarcus tried to use the Hammer of Dawn but Anya denied it, as there were Nemacyst inking the sky near their position; Delta had to go to "Plan B" which required to cut off a part of the train while the Berserker was on it, crushing her instantly.
When Delta Squad was heading via King Raven to Montevado, they came under heavy fire by several Nemacyst launched from Seeders stationed in the Dorado Hills, the pilot died from the impact of one of them, Jace Stratton soon took control of the aircraft but soon another Nemacyst hitted the landing gear of the Raven, however Jace managed to crash land the Raven and escape the Nemacyst.
During the Assault on Landown, several Seeders used Nemacyst to take down several King Ravens (including KR Four-One), Assault Derricks and Centaurs, despite this initial high casualties, Delta Squad was able to fend off most of the incoming Nemacyst Mortars with the Chain Gun mounted on their Rig. The Seeders were eventually killed, clearing the skies for the remaining King Ravens.
Later, in the town, Nemacysts had inked up the sky over the Gas station, stopping Delta from getting Air support. Delta was then tasked with clearing the Nemacysts so a KR could assist them.
On the road to Mount Kadar, Delta encountered Seeders launching Nemacysts at them, they tried to break the frozen lakes Delta had to pass through but failed. A Few shots fom the cannon on their centaur dislodged the beast, sending them plummeting to the valley floor.
While riding a Brumak in the Hollow under Jacinto, Marcus and Dom encountered countless Nemacysts hovering in the air space of the chasm. They used the Brumak's weapons to clear the air and kill the Seeders spawning them.
Their name is similar to the word Nematocyst, which are a defense mechanism for real-world cnidarian animals. Cnidarians include animals like jellyfish, and Nemacysts are similar in appearance to jellyfish, which could mean that Nematocyst inspired the name Nemacyst.
The Nemacyst can be chainsawed in RAAM's Shadow. There will be no actual animation, though if in Arcade mode, you will still get the points for the kill. The Nemacyst will also continue on its same path with no ill effect to itself.
The Ink Grenade is a Nemacyst infant, adult Nemacyst have not shown the hability to kill opponents by poisoning them though.