Binding of Isaac: Rebirth Wiki
Binding of Isaac: Rebirth Wiki

The Hollow is a boss that can appear in Catacombs Catacombs.

It has 22 HP per segment.


The number of individual The Hollow bodies that can spawn each fight can vary from 1-4. The most common encounter with The Hollow is with 2 bodies.

  • Flies around the room diagonally, bouncing off of walls.
    • The Hollow appears to travel faster when moving at verticle angles compared to horizontal.
    • The Hollow can change direction if it collides with Isaac.
  • Occasionally spawns poop while moving.
  • The Hollow's segments can be split into smaller copies of the boss as long as the new Hollow segments are longer than 2 pieces.

There is a chance that a Grub can spawn alongside a shorter Hollow (basically replacing a second Hollow).

Champion Versions Needs to be unlocked[]

  • Dark Grey: 15% larger, has slower movement and 25% more HP (27.5). Each segment that isn't the head spawns a Boom Fly when killed. Does not spawn any poop.
    • The head will spawn a Boom Fly only if killed immediately after spawning.
  • Gold: 15% larger and has 25% more HP (27.5) but retains the same movement speed. Each segment that isn't the head will drop a coin on death.
    • The head will drop a coin only if killed immediately after spawning.
  • Green: Chance for each segment that isn't the head to spawn a Charger on death. Occasionally stops movement to shoot 3 bullets at wherever it is facing.
    • The head will spawn a Charger only if killed immediately after spawning.



  • Removed in RepentancePoop spawned by The Hollow will never drop pickups, even when in possession of  Petrified Poop.
    • Added in RepentancePoops spawned by The Hollow have an incredibly low chance to spawn pickups. This chance is not affected by Petrified Poop.
    • Leaving the room and returning will make the poop generate pickups normally.
  • Piercing tears make fighting The Hollow much easier, as each tear can damage multiple segments.
    • Added in Repentance Piercing shots no longer damage segmented enemies multiple times per attack.


  • The Hollow was added in the Wrath of the Lamb DLC for the original The Binding of Isaac.
  • It is the posthumous version of Larry Jr..
  • The definition of hollow is empty on the inside or surface, which could explain the boss's paleness and complexion.
  • The Hollow is the only boss that has three Champion versions.
  • The Hollow is the only regular boss that can be spawned by Mega Satan between thresholds.


Bug Bug! Removed in Afterbirth † Sometimes this boss will get stuck in the wall when slowed.

Bosses Boss Monstro.png
Chapter 1
Stage Basement icon.pngStage Cellar icon.pngStage Burning Basement icon.png
GeminiStevenBlighted OvumDingleThe Duke of FliesFamineGurglingsThe HauntLarry Jr.MonstroPinWidowThe FallenThe Headless Horseman
DangleLittle HornRag ManTurdlings
Baby Plum
Chapter 1.5
Stage Downpour icon.pngStage Dross icon.png
Lil BlubWormwoodThe RainmakerMin-MinClogColostomiaTurdlet
Chapter 2
Stage Caves icon.pngStage Catacombs icon.pngStage Flooded Caves icon.png
FistulaChubC.H.A.D.Carrion QueenDark OneGurdyGurdy Jr.The HollowThe HuskMega FattyMega MawPeepPestilencePolycephalusThe WretchedThe FallenThe Headless Horseman
The ForsakenThe FrailThe Stain
Big HornRag Mega
Chapter 2.5
Stage Mines icon.pngStage Ashpit icon.png
Reap CreepTuff TwinsHornfelGreat GideonSingeThe ShellThe Pile
Chapter 3
Stage Depths icon.pngStage Necropolis icon.pngStage Dank Depths icon.png
The AdversaryThe BloatThe CageThe GateMonstro IIGishLokiMask of InfamyWarThe FallenThe Headless HorsemanMom
Sisters Vis
Reap CreepThe Pile
Chapter 3.5
Stage Mausoleum icon.pngStage Gehenna icon.png
The SirenThe HereticThe VisageThe Horny BoysMomMom's Heart
Chapter 4
Stage Womb icon.pngStage Utero icon.pngStage Scarred Womb icon.png
BlastocystThe BloatConquestDaddy Long LegsTriachnidDeathLokiiMama GurdyMr. FredScolexTeratomaThe FallenThe Headless HorsemanMom's HeartIt Lives
Sisters VisThe Matriarch
Stage Corpse icon.png
ChimeraThe ScourgeRotgutMother
Chapter 5
Stage Sheol icon.pngStage Cathedral icon.png
Chapter 6
Stage Dark Room icon.pngStage Chest icon.png
???The LambMega Satan
The Void
Stage The Void icon.png
Stage Home icon.png
DogmaThe BeastUltra DeathUltra FamineUltra PestilenceUltra War
Greed Mode
Ultra Greed
Ultra Greed
Ultra Greedier
The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth
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Pickups Pickups Pills Pills Rooms Rooms Seeds Seeds Transformations Transformations Trinkets Trinkets