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Swarm is a grenade skill which summons friendly pink biter worms to attack enemies.


  • Special Effects:
    • Throws an arcing projectile which explodes on contact with an enemy or a horizontal surface.
      • The projectile will bounce off of a Shieldbearer's shield without detonating.
    • Upon explosion, eight biters appear.
      • Biters target the nearest visible enemy on the same surface as them.
      • Biters use a bite attack 2 times a second which deals 9 base damage.
        • If this skill has an affix that grants any on-hit effect each biter's attacks will stack them to high levels, if given some time.
      • Biters can be killed if they take enough damage, though some enemies are unable to detect them due to their small size.
        • This includes environmental sources such as spikes, though they are immune to some other damage sources.
      • Each biter has a 30 seconds duration and will despawn after that. A maximum of 8 biters can exist at any given time and if any more spawn during this period the oldest spawned ones will vanish.
      • They may teleport to the player if they get too far.
  • Attack Duration: 0.4 seconds
    • Charge: 0.1
    • Lock: 0
    • Cooldown: 0.3
  • Tags: Deployable, DisableVerboseAmmo, NoCooldownReadySfx, ShortCooldown
  • Legendary Version:
    • Forced Affix: Poison on Hit
      • "Poisons the victim."


  • The biter limit of 8 appears to stack with other sources of generation, such as:
    • Parrying the ranged attack of the Festering Zombie.
    • Killing an enemy that has been damaged with an item that has the "Death Worm" modifier.


  • In earlier versions of the game, biters would attack golden doors, causing unnecessary curses.



  • 0.0: Introduced.
  • 0.1:
    • Biter hp decreased from 35 to 15.
    • Base biter damage decreased from 12 to 8.
    • Cooldown increased from 6 to 7 seconds.
    • Unlock cost increased from 10 to 30 cells.
    • Added tag "Deployable".
  • 0.4:
    • Cooldown increased from 7 to 10 seconds.
    • Now scales with Skill Hp.png Survival/ Brutality.
  • 0.6:
    • Scaling changer from Skill Hp.png Survival/ Tactics to Str Hp.png Brutality/ Survival.
    • Description changed.
  • 0.7:
    • Added starred affix "Poison On Hit".
  • 1.1:
    • Biters summoned per grenade decreased from 4 to 2.
    • Now can summon up to 8 biters.
    • Base biter damage decreased from 8 to 6.
    • Cooldown decreased from 10 to 0.4 seconds.
    • Biter duration increased from 10 to 30 seconds.
    • Added tags "NoCooldownReadySfx" and "ShortCooldown".
  • 1.2: Added tag DisableVerboseAmmo".
  • 1.3:
    • Cooldown increased from 0.4 to 0.8 seconds.
    • Biters per throw increased from 2 to 4.
  • 1.9:
    • Rally effect has been removed.
    • No longer activates cooldown reduction mutations.
  • 2.1:
    • Changed from Str Hp.png Brutality/Survival to Skill Stat.png Tactics.
    • Cooldown increased from 0.8 seconds to 10.
    • Biters per throw increased from 4 to 8.
  • 2.4:
    • Base health increased from 15 to 25.
    • Base biter damage increased from 6 to 9.
  • 2.9: Biters pets are now way more resistant to attacks and effects that don't specifically target them.
  • 3.0: Added the Legendary Affix "Poison on Hit".
Traps & Turrets
Double Crossb-o-matic Icon.pngDouble Crossb-o-maticSinew Slicer Icon.pngSinew SlicerHeavy Turret Icon.pngHeavy TurretBarnacle Icon.pngBarnacleFlamethrower Turret Icon.pngFlamethrower TurretCleaver Icon.pngCleaverWolf Trap Icon.pngWolf TrapCrusher Icon.pngCrusherExplosive Decoy Icon.pngExplosive DecoyEmergency Door Icon.pngEmergency DoorTesla Coil Icon.pngTesla CoilScavenged Bombard Icon.pngScavenged BombardTQatSNight Light Icon.pngNight Light
Powerful Grenade Icon.pngPowerful GrenadeInfantry Grenade Icon.pngInfantry GrenadeCluster Grenade Icon.pngCluster GrenadeMagnetic Grenade Icon.pngMagnetic GrenadeStun Grenade Icon.pngStun GrenadeIce Grenade Icon.pngIce GrenadeFire Grenade Icon.pngFire GrenadeRoot Grenade Icon.pngRoot GrenadeOil Grenade Icon.pngOil GrenadeSwarm Icon.pngSwarmHunter's Grenade Icon.pngHunter's GrenadeHoly Water Icon.pngHoly WaterRtC
Barricade Icon.pngBarricadeDeath Orb Icon.pngDeath OrbTornado Icon.pngTornadoKnife Dance Icon.pngKnife DanceCorrupted Power Icon.pngCorrupted PowerVampirism Icon.pngVampirismTonic Icon.pngTonicGrappling Hook Icon.pngGrappling HookPhaser Icon.pngPhaserCorrosive Cloud Icon.pngCorrosive CloudLacerating Aura Icon.pngLacerating AuraWave of Denial Icon.pngWave of DenialWings of the Crow Icon.pngWings of the CrowBlueprint Extractor Icon.pngBlueprint ExtractorForgotten Map Icon.pngForgotten MapGreat Owl of War Icon.pngGreat Owl of WarLightspeed Icon.pngLightspeedGiant Whistle Icon.pngGiant WhistleRotGTelluric Shock Icon.pngTelluric ShockSmoke Bomb Icon.pngSmoke BombTBSMushroom Boi! Icon.pngMushroom Boi!TBSLightning Rods Icon.pngLightning RodsFFScarecrow's Sickles Icon.pngScarecrow's SicklesFFIce Armor Icon.pngIce ArmorRotGSerenade Icon.pngSerenadeFFCocoon Icon.pngCocoonFFFace Flask Icon.pngFace FlaskPollo Power Icon.pngPollo PowerLeghugger Icon.pngLeghuggerTQatSTaunt Icon.pngTauntRebound Stone Icon.pngRebound StoneRtCMaria's Cat Icon.pngMaria's CatRtCBat Volley Icon.pngBat VolleyRtC
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