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Swarmer is a new type of enemy added in the expansion Wrath of the Lamb, which can be found in Necropolis.

Behavior

They act similar to the Duke of Flies. This enemy will constantly spawn regular Flies. However, when hit, he will spit out two Pooters or Fat Flies in variation. When the Swarmer is destroyed, it will spawn a Boom Fly or a Red Boom Fly.

This enemy does not shoot projectiles, so it's best to kill the flies first. If the player has considerable firepower, focusing fire on him hoping to kill the Boom Fly as soon at it spawns (and the surrounding flies with its blast radius) is also a viable strategy.

They can float across the room, which can be annoying when there are rocks blocking your shots. In the XL room, they may also float from a dark place, making them hard to see and easier for them to inflict damage on Isaac.

It is also worth noting that Swarmers are immune to the touch-damage effect conferred by the item My Little Unicorn, the Chariot tarot card or the Virus. On the other hand, this enemy does not deal touch damage.

Eternal Champion Behavior

Eternal Swarmers spawn Eternal Flies instead of regular Flies, one Pooter and one Eternal Fly when damaged, and will split into 3 non-Eternal Swarmers when killed.

Trivia

  • This enemy is the next and possibly the final stage of the original Mulligan. As seen how the Black Flies nested inside the Mulligan, they multiplied forming the Hive, and eventually took control of the Hive, forming the Swarmer, being nothing but a flying nest of flies. It's very intentional considering the game theme of decay, how in the early chapters they seem partially "infected" by the flies, and they eventually decayed over time in the later floors.[1]
    • Given that the Gaper, Mulligan, Hive, and Swarmer are all the same monster in stages of decay and infestation, the Swarmer seems to be in the severe stages of decay, to the point of being practically nothing but a skull by this point.

References

Monsters
Fly.png
Black Fly
CUSTOMredfly.png
Attack Fly
Moters.png
Moter

White fly.png
Eternal Fly
DLC.png
Pouter.png
Pooter

Superpooter.png
Fat Fly
DLC.png
Boomfly.png
Boom Fly
Spitfly.png
Red Boom Fly
Gaper.png
Gaper

Frowninggaper.png
Frowning
Gaper

Green gaper.png
Gurgle
DLC.png
Shape4336.png
Mr. Maw
Mulligan.png
Mulligan
Mulligoon.png
Mulligoon
Mulliboom.png
Mulliboom
DLC.png
Hive.png
Hive


Pacer.png
Pacer
Gusher.png
Gusher


Hopper.png
Hopper

FHopper.png
Flaming
Hopper


Leaper.png
Leaper
Vis.png
Vis

Vis Fio.png
Double Vis
DLC.png

Chubby Vis.png
Chubber
DLC.png
Sucker.png
Sucker

Puffer.png
Spit
DLC.png

Black spider.png
Spider
DLC.png

Big spider.png
Big Spider
DLC.png
Spider hopper.png
Trite
DLC.png
Maggot.png
Maggot
Charger.png
Charger
Spity.png
Spitty
Globin.png
Globin

Globin 2.png
Gazing
Globin
Knights.png
Knight

Alternative knight.png
Selfless
Knight
Horfs.png
Horf
Maws.png
Maw
Redmaw.png
Red Maw

Psychicmaw.png
Psychic
Maw

DLC.png
Boil.png
Boil

Green boil.png
Gut
DLC.png

White boil.png
Sack
DLC.png
Clotty.png
Clotty

Clot2.png
Clot


Blockade.png
I. Blob
DLC.png
Eye.png
Eye

Eye2.png
Bloodshot
Eye
Host1.png
Host
Host2.png
Red Host
Boby.png
Baby
Angel baby.png
Angelic Baby
DLC.png

Avarice.png
Keeper
DLC.png
Hang man.png
Hanger
DLC.png
Pokies.png
Poky

Spike trap.png
Slide
DLC.png
Brain.png
Brain
Membrain.png
Membrain
GutsMonster.png
Guts
Big guts.png
Mama Guts
Leech.png
Leech

Leech2.png
Kamikaze
Leech

Holy leech.png
Holy
Leech

DLC.png
Parabite.png
Para-Bite
Swarmhead.png
Swarmer
DLC.png
Mask Heart.png
Mask + Heart
DLC.png
Centipede.png
B. Licker
DLC.png
Fred.png
Fred
Lump.png
Lump
Embryo.png
Embryo
Dople1.png
Dople
Dople 2.png
Twin Evil
Turret.png
Stone Grimace

VomitTurret.png
Vomit Grimace
DLC.png
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