Xxx form2Isaac RebirthKeeper sprite

The Hollow (ザー・ホロー Zā Horō) is the posthumous version of the boss Larry Jr. that spawns in the Catacombs.


It consists of two enemies - one with 4 segments and one with 5; each flies diagonally across the screen.

The movement of the boss resembles that of Fistula, though each segment can change the angle at which it bounces around the room, making dodging more difficult. The segments can be damaged and destroyed individually like with Larry Jr., which causes piercing tears to be very effective against him. If the room is filled with rocks, players may find themselves having a hard time dodging the Hollow, as the rocks will block player's movement (unless the player can fly), while the Hollow can fly over them.

Like with Larry Jr, each of the Hollow's segments are destroyed separately, therefore using The Necronomicon will instantly kill the Hollow.

The Hollow has a higher chance of appearing if you've killed Larry Jr before.

Champion Variants


Hollow yellow

Each segment drops a coin when destroyed. Being hit by this variant of The Hollow will cause Isaac to drop coins.


Hollow black

Each segment spawns a Boom Fly when destroyed.


Hollow green

Shoots a row of three bullets as an additional attack. Each segment spawns a Charger when destroyed.


Eternal Hollow

This variant of the Hollow moves in a slightly altered pattern. It bounces off walls as usual, but also tries to chase Isaac by curving toward him. Each segment spawns a random amount of Attack Flies, Pooters or Fat Flies when destroyed. Much like Eternal Larry Jr, if its head is the only segment, it will move at 1/2 of its original speed and leave creep on its trail, though it will directly pursue Isaac rather than wandering around the room. It will not gain new segments.



  • Sometimes, the green champion variant of The Hollow will use Larry Jr.'s head sprite when firing blood shots.
    • Similarly, the green champion variant of Larry Jr. will use The Hollow's head sprite when firing blood shots.
  • When the head of the Hollow spawns, the guts of a Host will be visible underneath, but will disappear after the smoke fades.


  • The Hollow probably has the most amount of Champion Variants.
  • In Rebirth, its head's HP has been reduced to the same as its body.


Magdalene vs. The Hollow - TBoI 1

Magdalene vs. The Hollow - TBoI 1.333 Petden

The Hollow fight

The Binding of Isaac / Rebirth
Regular bosses Original: BlastocystChubDuke of FliesThe FallenFistulaGeminiGurdyLarry Jr.LokiMonstroPeepScolex
(Wrath of the Lamb: Daddy Long LegsGurdy Jr.Mask of InfamyPinWidow)

Rebirth: Dark OneDingleGurglingsThe HauntMama GurdyMega FattyMega MawMr. FredPolycephalus
(Afterbirth: BrownieDangleLittle HornRag ManTurdlings)
(Afterbirth †: Big HornRag Mega)

Posthumous Bosses Original: Monstro II
(Wrath of the Lamb: The Blighted OvumThe BloatCarrion QueenThe HollowThe HuskLokiiTeratomaThe Wretched)

Rebirth: The AdversaryThe CageThe Gate
(Afterbirth: The ForsakenThe FrailThe Stain)

Alternative Bosses Original: C.H.A.D.GishSteven
(Wrath of the Lamb: Triachnid)

Rebirth: Sisters Vis (Afterbirth †)

Harbingers Original: WarFamineDeathPestilenceHeadless Horseman

(Wrath of the Lamb: Conquest)

Final Bosses Original: It LivesMomMom's HeartSatan
(Wrath of the Lamb: ???Isaac)

Rebirth: The LambMega Satan
(Afterbirth: HushUltra Greed)
(Afterbirth †: Delirium)

Seven Deadly Sins EnvyGluttonyGreedLustPrideSlothWrath
Seven Super Deadly Sins Super EnvySuper GluttonySuper GreedSuper LustSuper PrideSuper SlothSuper WrathUltra Pride
Angels / Demons Original: Krampus

Rebirth: GabrielUrielFallen Angels

The Legend of Bum-bo
Regular bosses BygoneDuskGibsGizzardaLoafPeeperPyreSangreShy GalThe Duke
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