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11 The Grell are one of the four main factions in ZeroSpace, an insectoid race living in symbiosis with the plant-like Koru. Their motto, "Grow. Expand. Exterminate.", describes how they play: they are relentless terraformers who spread biomass across a planet to prepare the ground for the Koru to take root and thrive.
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33 In the setting they are a tide of highly evolved creatures that spawn sites of raw flux crystals across the galaxy, and they were humanity's first contact with alien life. The plant-like half of the partnership is the Koru. The Grell themselves are insectoid, a distinction the official page blurs by calling them plant-like in its own story text. As the powers of the Orion Sector dug deeper into flux to fuel faster-than-light travel, the once passive Grell began to flood across worlds and wipe out anything that threatened their biosphere.
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66 How They Fight
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88 TraitEffectSpread the BloomBiomass creeps outward across the battlefield and feeds Grell expansion. Enemies standing on it have their vision reduced.OverwhelmWaves of evolved creatures consume anything that holds its ground.InfuseA strategic infusion turns a chosen creature into a far more dangerous monster in the middle of a fight, trading resources for raw power.Koru SymbiosisThe Koru side of the partnership provides healing support, and Grell upgrades such as Rapid Germination speed up how quickly their structures grow.
99 Commander
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1111 The Grell are led by Vynthra, the Avatar of the Planetmind, who can be selected as the commander for Galactic War missions. See Heroes and Commanders for how commanders work across the game.
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1313 Forces
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1515 The official faction page shows four sample units and says the full list is coming later. The current build data covers 14 Grell units and 12 structures, read in September 2026. Several Grell creatures come out of the womb in batches from a single order, so the cost below buys the whole batch while supply is charged per creature.
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1717 Each creature has its own page, reachable from the table below or from the index on Units. Hexite and flux both come out of the economy described on Resources and Economy.
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1919 UnitRoleCostSupplyHealth and ArmorStingerFast small melee creature, ordered three at a time75 Hexite for three1 each100, Light armorLasherRanged attacker50 Hexite, 25 Flux2150, Light armorMandragoraShort range bruiser that deals area damage100 Hexite, 25 Flux3350, Medium armorKeeperTanky melee creature that spawns Arkanids when it takes damage, ordered as a pair150 Hexite, 50 Flux for two2 each225, Medium armorHarbingerDurable ranged creature that causes damaging eruptions75 Hexite, 50 Flux4400, Heavy armorSkrellLight skirmish flier that poisons on attack, ordered three at a time50 Hexite, 75 Flux for three1 each60, Light armorThresherLong range siege creature with splash damage100 Hexite, 175 Flux6350, Heavy armorWeaverCaster that deals bonus damage against air75 Hexite, 150 Flux4200, Medium armorBehemothFlying brawler that periodically deals area damage over time on attacks100 Hexite, 200 Flux8700, Heavy armorReaverTanky melee creature with the Ravage ability200 Hexite, 100 Flux8900, Heavy armorArkanidSmall timed-life creature spawned by other Grell unitsSpawnedNone5, Light armorBoomerTimed-life explosive creatureSpawnedNone150, Medium armorSeedlingBuilder that can only build on biomass; becomes a fast flying scout when infused, and keeps buildingSpawnedNone20, Light armorGathererFlux harvester that can spawn Cultivators, respawning 60 seconds after it dies100 HexiteNone275, Medium armor
2020 The official page picks out the acidic Harbinger and the rampaging Reaver as the two evolutions that define the faction, and the Harbinger received a dedicated animation pass during development. The Behemoth appeared in an early unit showcase before launch. The Lasher's bonus damage against medium armor now comes entirely from its Corrosive Secretion upgrade: the base attack lost that bonus on August 11, 2026, while the upgrade bonus rose from +50% to +75%.
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2222 Structures
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2424 Grell structures grow out of the biomass mat rather than being placed freely, and the Seedling that raises them can only build on biomass. Broodwomb, Incubator and Elderwomb also gate mercenary hiring at tiers 1, 2 and 3.
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2626 StructureRoleCostHealthBloomwellMining outpost that raises Feeder Vines on a hexite patch, upgradeable to attack400 Hexite2,500Feeder VineHexite extractor, grown by the BloomwellGrown by the Bloomwell225CultivatorGenerates biomass and can be upgraded to attack15 Hexite150Nourishing PodProvides 12 supply and heals nearby units75 Hexite500BroodwombBasic creature production75 Hexite1,000Young CanopyResearch for Broodwomb creatures, and unlocks Mandragoras and Incubators100 Hexite, 25 Flux1,000IncubatorMedium creature production100 Hexite, 50 Flux1,200SkyclutchEnables Skrell and Behemoth production100 Hexite, 25 Flux1,000ElderwombAdvanced creature production125 Hexite, 100 Flux1,400Synapse CanopyResearch for Elderwomb creatures and second-tier Incubator upgrades100 Hexite, 75 Flux1,000Deep NestTop bar ultimate that spawns 7 Arkanids every 2 seconds while losing 15 life per secondTop bar ultimate300Tree of LifeTop bar ultimate that revives units killed nearby and heals allies within a 1,500 radiusTop bar ultimate1,000
2727 Since an update on August 14, 2026 the Grell starting base begins with a full patch of biomass already established, which removes the opening scramble to spread enough mat to build on. Their structures and creatures are tuned continually through balance updates during Early Access.
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2929 Balance Since Launch
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3131 The figures above describe build ZS.c36778, current in September 2026. The changes that produced them:
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3333 DateUnit or UpgradeChangeAugust 11, 2026InfuseCost multiplier raised from 0.045 to 0.05, matching the Protectorate shield and Legion Reanimate, with the infused bonus to damage, health and regeneration cut from +50% to +45%August 11, 2026Koru SymbiosisIncreased healing cut from +30% to +25%August 11, 2026Rapid GerminationConstruction speed bonus cut from +50% to +40%August 11, 2026LasherBase attack lost its bonus against medium armor, damage raised from 17 to 18, and the Corrosive Secretion medium bonus raised from +50% to +75%August 11, 2026SkrellDamage bonus changed from +150% against harvesters to +50% against medium armor when the harvester armor type was retiredAugust 11, 2026StingerHealth raised from 90 to 100August 11, 2026GathererMove speed cut from 510 to 500August 11, 2026Infused SeedlingHealth raised from 70 to 75August 14, 2026Deep NestPower cost raised from 15 to 18August 14, 2026BoomerSpawn count cut from 4 to 3, health cut from 250 to 150, and explosions no longer damage air unitsAugust 14, 2026Rapid GerminationConstruction speed bonus cut again from +40% to +30%August 28, 2026BehemothHealth raised from 625 to 700 and weapon damage from 30 to 35, with range cut from 12 to 11, the bonus against heavy armor cut from +200% to +100%, and the Colossal Maw range increase cut from +6 to +5August 28, 2026SkrellHealth raised from 50 to 60, damage from 5 to 6, and the bonus against medium armor from +50% to +100%August 28, 2026ThresherHealth raised from 300 to 350, and weapon splash now deals full damage to everything in the areaAugust 28, 2026StingerUpgrades reorganized from three tiers to two, and Biomass Submersion changed from +100% attack speed on biomass to +300 move speed on biomassAugust 28, 2026CultivatorHealth cut from 250 to 150, with the attacking version cut from 75 hexite to 50 and from 400 health to 300, and its damage per second cut from 17.65 to 13.64August 28, 2026Nourishing PodHeal interval lengthened from 0.8 to 1 second and healing per energy cut from 5 to 4August 28, 2026Harbinger and LasherThe Harbinger second tier upgrade cut from 200 flux to 125, and the Lasher second upgrade tier moved from the Synapse Canopy to the ElderwombAugust 28, 2026Mycelial ReachGatherer Spawn Cultivator bonus cast range raised from +200% to +250%August 28, 2026Exalted and MammothBoth gained the beast tag, which matters to the Grell only through mercenary and Legion interactions
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3535 Playing Against the Grell
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3737 Because the Grell economy grows with the biomass mat, denying that spread is the usual counterplay. In Skirmish the Grell are one of the four factions on the ranked ladder, and the standings track a separate per-faction rating as well as a total-damage board for the faction. The Protectorate pages describe the opposite approach, a slower and more defensive style built on holding ground rather than spreading over it.
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39+October 3, 2026: Galactic War / Vynthra
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41+For Vynthra, Cultivator Biomass generation range increased from 21 to 24 and health from 150 to 400. Cultivator Attacker health increased from 600 to 1,000.
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43+September 23, 2026: Versus, Skirmish and Survival
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45+Grell building regeneration fell from four to one health per second. Harvester health fell from 275 to 250, base health regeneration was removed and stationary Harvesters no longer generate Biomass. Spawn Cultivator starts on cooldown and can be placed off Biomass.