Monsters

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Monsters refers to the many antagonistic creatures the player will encounter throughout the game.

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Issues: Is missing all Repentance entries except Needles and Army Flies.

Most monsters (with few exceptions) will damage Isaac by either touching him or shooting him with projectiles. Less frequently, monsters will spawn additional, lesser monsters, spread creep, or attempt to affect the player's movement. Along with the more common variety of monsters, champion versions can be found lurking about. These monsters are often like their common counterparts, but have a color tint or size change and drop basic pickups on death. There are also champion versions of most bosses.

There are 196 naturally spawning monsters in total. 40 of them were added in Afterbirth and 21 were added in Afterbirth † (13 were added in Booster Packs). Almost all of these naturally spawning entities are featured in the Added in Afterbirth † Bestiary, with the exceptions being the Rag Man's Ragling and Suction Pitfall.

Monster List

Monster Description

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Champions

Some monsters can spawn as a Champion which deviates in coloration and size. The champion's coloration/size denotes which peculiar behaviors and traits it will exhibit. Champions will generally drop a pickup (coinciding with the color of the champion) when killed on normal difficulty. However, in hard mode, the drop rate is reduced to 33%, while in Greed Mode, champions won't drop pickups at all.

Most champions have a visual 15% size increase, inflict full heart damage regardless of chapter, and have double the health of a normal monster. Champions are generally regarded as more dangerous than common monsters.

Removed in Afterbirth † Champions always deal contact damage, regardless of what monster they are (e.g. a common Mulligan will not deal contact damage, but champion versions will).

The identifying scheme for champion qualities is as follows:

ID Appearance Effect Drop Rarity Notes
0 Champion Red.png
Vivid Red
×2.5 amount of HP. Heart Common
1 Champion Yellow.png
Dark Yellow
Increased movement speed.
Added in Repentance These champions cannot spawn during Chapter 1.
Little battery Common
2 Champion Green.png
Strong Lime Green
Leaves green creep as it walks. Pill Common
3 Champion Orange.png
Vivid Orange
Attacks cause you to drop coins (like Greed or a Hanger).

The number of coins dropped range from 1-3, which take away 2-4 coins in total respectively. No coins are dropped if you don't have any.

Coin Around 2x rarer than common champions.
4 Champion Dark Blue.png
Vivid Blue
Decreased speed. 3 Blue Flies Around 2x rarer than common champions.
5 Champion Dark Green.png
Dark Cyan
Explodes when killed. Bomb Common
6 Champion Solid White.png
White
Invincible until all other enemies are killed. Eternal Heart Around 10x rarer than common champions. Doesn't appear until entering Normal and hard modes onlyThe Depths The Depths and its alts, or Greed and greedier modes onlySheol Sheol in Greed Mode.
7 Champion Gray.png
Dark Gray
2/3 health, decreased speed. Key Common
8 Champion Transparent White.png
Transparent White
Tears become spectral tears, and it can move past environmental obstacles (such as pits) that it otherwise couldn't when forced. Locked Chest Around 10x rarer than common champions. Doesn't appear until entering Normal and hard modes onlyThe Depths The Depths and its alts, or Greed and greedier modes onlySheol Sheol in Greed Mode.
9 Champion Black.png
Black
Fades in and out of visibility, like a Null. Red Chest Around 10x rarer than common champions. Doesn't appear until entering Normal and hard modes onlyThe Depths The Depths and its alts, or Greed and greedier modes onlySheol Sheol in Greed Mode.
10 Champion Pink.png
Pure Magenta
Periodically shoots short-ranged blood shots, similar to Gushers. Nothing Common
11 Champion Purple.png
Mostly Pure Violet
Pulls Isaac and his shots towards itself, like a Gaping Maw. Random trinket Around 10x rarer than common champions. Doesn't appear until entering Normal and hard modes onlyThe Depths The Depths and its alts, or Greed and greedier modes onlySheol Sheol in Greed Mode.
12 Champion Dark Red.png
Dark Red
Collapses into a flesh pile upon death and regenerates if not finished off (like a Globin). Double Heart Around 2x rarer than common champions.
13 Champion Light Blue.png
Very Light Blue
Releases blood shots in 8 directions when killed. 1/2 heart Common
Added in Afterbirth Afterbirth
14 Champion Camouflage.png
Camouflage
The enemy blends into the background and briefly becomes visible when damaged. Rune Around 4x rarer than common champions.
15 Champion Pulsing Green.gif
Pulsing Strong Lime Green
Splits into two copies of itself upon death. 2 normal versions of itself Around 4x rarer than common champions.
16 Champion Pulsing Gray.gif
Pulsing Dark Gray
Repels Isaac's shots when it pulses. Nothing Around 4x rarer than common champions.
17 Champion Light White.png
Light White
Has 1-2 Eternal Flies circling it. Spawns another fly upon death. Attack Fly Around 4x rarer than common champions.
18 Gaper.png
Small
Decreased health, increased speed and pitch of sound effects. 50% smaller both visually and collision-wise, making them more difficult to hit. One Makes You Small pill at 1/5th of difficulty based drop rate. Around 4x rarer than common champions. Using the pill dropped will change all other pills matching its color into One Makes You Small pills.
19 Gaper.png
Large
Increased health, slightly decreased speed and decreased pitch of sound effects. Visually 50% larger, though collision remains the same. Deals two full hearts of damage. One Makes You Larger pill at 1/5th of difficulty based drop rate; can change other pills in the current rotation. Around 4x rarer than common champions. Using the pill dropped will change all other pills matching its color into One Makes You Larger pills.
Added in Afterbirth † Afterbirth+
20 Champion Pulsing Red.gif
Pulsing Vivid Red
All other enemies in the room regenerate health at the rate of 20 HP per second while this enemy is alive. Heart Around 10x rarer than common champions. Doesn't appear until entering Normal and hard modes onlyThe Depths The Depths and its alts, or Greed and greedier modes onlySheol Sheol in Greed Mode.
21 Champion Pulsating.gif
Pulsating
Spawns an Attack Fly on hit. After each hit, there is a delay until the next hit results in another Attack Fly. A single Pulsating enemy can have up to 5 Attack Flies at once. 4-6 Blue Flies Around 10x rarer than common champions. Doesn't appear until entering Normal and hard modes onlyThe Depths The Depths and its alts, or Greed and greedier modes onlySheol Sheol in Greed Mode.
22 Champion Crown.png
Crown
Increased health. All enemies in the room that are not champions will turn yellow while the crowned enemy is alive. The affected enemies will drop batteries like yellow champions upon dying, but otherwise have no extra health, speed or damage 2-3 random pickups Around 10x rarer than common champions. Doesn't appear until entering Normal and hard modes onlyThe Depths The Depths and its alts, or Greed and greedier modes onlySheol Sheol in Greed Mode.
23 Champion Skull.png
Skull
Produces a 15►The Necronomicon The Necronomicon effect upon death. Deals two full hearts of damage. 15►The Necronomicon The Necronomicon effect Around 10x rarer than common champions. Doesn't appear until entering Normal and hard modes onlyThe Depths The Depths and its alts, or Greed and greedier modes onlySheol Sheol in Greed Mode.
Added in Repentance Repentance
24 50px
Brown
Trails poop behind it as it walks. Nothing Unknown
25 50px
Rainbow
Combines the effects of champion types 0, 2, 5, 10, 11, 13 and 17. A coin, a bomb, a key, a heart, a pill, a card and a trinket. Unknown

The chances for Champion monsters to appear are noted in the table below:

Modifiers Normal mode Hard mode The Void The Void
Base chance 5% 20% 75%
15►Champion Belt Champion Belt 20% 35% 75%
Purple Heart Purple Heart 10% 40% 100%
Purple Heart Purple Heart + Added in Afterbirth15►Mom's Box Mom's Box 20% 80% 100%
15►Champion Belt Champion Belt + Purple Heart Purple Heart 40% 70% 100%
15►Champion Belt Champion Belt + Purple Heart Purple Heart + Added in Afterbirth15►Mom's Box Mom's Box 80% 100% 100%
  • 15►Champion Belt Champion Belt adds 15% to the base champion chance. This has no effect in The Void The Void.
  • Purple Heart Purple Heart doubles the champion chance, and stacks with Champion's Belt.
    • Added in Afterbirth15►Mom's Box Mom's Box changes Purple Heart to quadruple the chances instead of doubling.

Monster Replacements

Some monsters have a chance to be replaced with other monsters when they spawn, Added in Afterbirth † but only at room entry. Added in Afterbirth Some replacements only occur on certain floors.

(Disclaimer: Chances are approximate!)

Base Monster Replacement Chance Notes
Rebirth
Mulligan.png Mulligoon.png 10%
Mulligan.png Mulliboom.png 1%
Mulligoon.png
Hopper.png Trite.png 6%
Stone Grimace.png Vomit Grimace.png 6%
Dople.png Evil Twin.png 5%
Eye.png Bloodshot Eye.png 5%
Leech.png Kamikaze Leech.png 5%
Leech.png Holy Leech.png 1%
Kamikaze Leech.png
Maw.png Red Maw.png 10%
Maw.png Psychic Maw.png 1%
Red Maw.png
Host.png Red Host.png 10%
Vis.png Double Vis.png 6%
Vis.png Chubber.png 1%
Double Vis.png
Boom Fly.png Red Boom Fly.png 10%
Pooter.png Super Pooter.png 10%
Knight.png Selfless Knight.png 5%
Clotty.png I.Blob.png 1%
Clot.png
MemBrain.png Mama Guts.png 6%
Globin.png Gazing Globin.png 10%
Baby.png Angelic Baby.png 6%
Boil.png Gut.png 6%
Boil.png Sack.png 1%
Gut.png
Walking Boil.png Walking Gut.png 6%
Walking Boil.png Walking Sack.png 1%
Walking Gut.png
Sucker.png Spit.png 6%
Poky.png Slide.png 6%
Added in Afterbirth Afterbirth
Frowning Gaper.png Flaming Gaper.png 60% Exclusive to Burning Basement Burning Basement
Gaper.png
Fatty.png Flaming Fatty.png 60% Exclusive to Burning Basement Burning Basement
Only a single Burning Basement room contains a Pale Fatty, making it a very unusual replacement to witness.
Pale Fatty.png
Hopper.png Flaming Hopper.png 60% Exclusive to Burning Basement Burning Basement
Trite.png
Hive.png Drowned Hive.png 50% Exclusive to Flooded Caves Flooded Caves
Maggot.png Drowned Charger.png 50% Exclusive to Flooded Caves Flooded Caves
Charger.png
Spitty.png
Boom Fly.png Drowned Boom Fly.png 50% Exclusive to Flooded Caves Flooded Caves
Red Boom Fly.png
Squirt.png Dank Squirt.png 50% Exclusive to Dank Depths Dank Depths
Death's Head.png Dank Death's Head.png 50% Exclusive to Dank Depths Dank Depths
Globin.png Dank Globin.png 50% Exclusive to Dank Depths Dank Depths
Gazing Globin.png
Guts.png Scarred Guts.png 50% Exclusive to Scarred Womb Scarred Womb
Para-Bite.png Scarred Para-Bite.png 50% Exclusive to Scarred Womb Scarred Womb
Vis.png Scarred Double Vis.png 50% Exclusive to Scarred Womb Scarred Womb
Double Vis.png
Added in Afterbirth † Afterbirth+
Keeper.png Blister.png 10%
Ticking Spider.png 20%
Host.png Mushroom (Enemy).png 20%
Red Host.png
Hopper.png Ministro.png 20%
Trite.png
Nerve Ending.png Nerve Ending 2.png 20%
Brain.png Poison Mind.png 20%
Pale Fatty.png Stoney.png 10%
Wall Creep.png The Thing.png 20%
Blind Creep.png
Rage Creep.png
Mr Maw.png Mr. Red Maw.png 20%
Skinny.png Crispy.png 40% Exclusive to Burning Basement Burning Basement
Rottys do not appear in any Burning Basement room layouts, but can still be replaced regardless.
Rotty.png
Dank Charger.png Drowned Charger.png 50% Exclusive to Flooded Caves Flooded Caves
Dank Chargers do not appear in any Flooded Caves room layouts, but can still be replaced regardless.
Stoney.png Cross Stoney.png 20% Exclusive to Aprils Fool challenge


The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth
Achievements Achievements Attributes Attributes Bosses Bosses TarotCard.png Cards and Runes Challenges Challenges Chapters Chapters
Characters Characters MainPageBabies.png Co-op Items Items Item pools Item pools Monsters Monsters Objects Objects
Pickups Pickups Pills Pills Rooms Rooms Seeds Seeds Transformations Transformations Trinkets Trinkets