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Boils are spherical monsters encountered in The Caves/The Catacombs and The Depths/Necropolis.

Its bipedal variant (Walking Boil) was introduced in the Wrath of the Lamb DLC, where it can be encountered in The Catacombs, Necropolis, and both levels of Chapter 4 (The Womb and Utero).

Behavior

They start off as a small red sphere and slowly grow to full size. When at their full size, they can spurt out short-ranged blood shots at Isaac, similar to one of Monstro's attacks. Boils decrease in size when hit, but will regenerate to their full size until fully destroyed.

Boils are nearly harmless on their own, as they can simply be killed from a distance and do not deal damage on contact. With other enemies, however, they are far more dangerous: If Isaac enters a room with a large crowd of enemies and several Boils providing covering fire, taking out enough of the Boils to give himself breathing room should be a big priority.

Champion VariantDLC.png

Eternal Boils fire significantly more blood shots. They are some of the easiest eternal enemies, as they still do not attack when they are not at full size.

This variant was added in the Eternal Edition update but can be exclusively encountered in Hard Mode.

Notes

  • They can be spawned by Gurdy, the green alternate Chub, and the pink alternate Widow.
Monsters
Fly.png
Black Fly
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Attack Fly
Moters.png
Moter

White fly.png
Eternal Fly
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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

Gurgle.png
Gurgle
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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
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Spider hopper.png
Trite
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Maggot.png
Maggot
Charger.png
Charger
Spity.png
Spitty
Globin.png
Globin

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Gazing
Globin
Knights.png
Knight

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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
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White boil.png
Sack
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Clotty.png
Clotty

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Clot


Blockade.png
I. Blob
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Eye.png
Eye

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Bloodshot
Eye
Host1.png
Host
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Red Host
Boby.png
Baby
Angel baby.png
Angelic Baby
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Keeper.png
Keeper
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Hang man.png
Hanger
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Poky.png
Poky

Slide.png
Slide
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Brain.png
Brain
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Membrain
GutsMonster.png
Guts
Big guts.png
Mama Guts
Leech.png
Leech

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Kamikaze
Leech

Holy leech.png
Holy
Leech

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

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Vomit Grimace
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