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The Bloat is a boss added in the Wrath of the Lamb DLC. He is the posthumous version of Peep. He can be encountered in Necropolis, The Womb/Utero or as a mini-boss in The Chest.

His eyes are popped out right from the beginning of the fight.


The Bloat's attacks consist of the following:

  • The Bloat will fire two blood beams from both his eye sockets (A bit smaller than a Brimstone Laser). The Bloat will only do this if the player is standing directly in front or to the sides of him. There is no reaction time or clear indication when he uses this attack. However, if you are aware and fast enough, you can tell he is about to use this attack when he bobs down. This is his only new attack when compared to Peep.
  • A spray attack that sends globs of blood flying out in a radial burst pattern.
  • A launcher that brings him crashing down on the location he last saw the player standing in. Much like the next attack, a puddle of red Creep is created where he lands.
  • Spawning a puddle of Creep that damages you if you stand in it. This goes away after 5–6 seconds.
  • Both of the Bloat's eyes start detatched from their sockets, much like one of the champion versions of Peep. These will patrol the room and damage the player if he crosses paths with them.

Since The Bloat will attack you with his blood-beams if you are standing to the front or sides of him, it is best to attack him from behind. Otherwise, he behaves nearly exactly like Peep.

His eyes seem to be affected by Skatole, making them slower. This is due to the fact that the AI of his eyes are derived from Boom Flies.

If you're not behind him try to shoot tears diagonally at him while moving without entering his "blood-beam-area".

There is a way to lock him in a pattern of constantly firing his blood-beams, similarly to Monstro II, but this takes incredible reaction, since the attack comes so quickly, unlike Monstro II. Simply stay in front of him until he fires his blood beam, then attack him from the side. When he fires his side blood-beams, move back in front of him. Lather, rinse, and repeat.


  • Upon the start of the battle, it is worth knowing that when entering the boss room directly beside or in front of The Bloat, it will immediately attack you with its Blood Beam. Unless players are prepared for this, it will almost always lead to unavoidable damage.

Champion Variants


Green Bloat

Launches 3 IPECAC bombs randomly instead of blood shots upon landing. Also spawns 2 Chargers when spawning Creep. This variant has a little less health and still fires the blood beams from his eyes.



  • Bloat is a medical condition in which the stomach becomes overstretched by excessive gas content.
  • The Bloat is called Peep 2 by Edmund.1
  • Bloat's eyes seem to derive from Boom Flies in their AI as they move in a diagonal pattern and are slowed by Skatole. If you are killed by an eye, similar to Peep, the picture on the death note is of a Boom Fly.
  • When you get killed by the Bloat, his picture on the death note is that of Peep's.
  • Killing Peep in The Caves increases the chance of meeting The Bloat in the Womb.


The Binding of Isaac The Bloat Boss Battle

The Binding of Isaac The Bloat Boss Battle

Regular Bosses
BlastocystChubDaddy Long LegsDark OneDingleDuke of FliesThe FallenFistulaGeminiGurdyGurdy Jr.GurglingsThe HauntLarry Jr.LokiMama GurdyMask of InfamyMega FattyMega MawMonstroMr. FredPeepPinPolycephalusScolexTurdlingsWidow

Afterbirth: BrownieDangleLittle HornRag ManTurdlings
Afterbirth †: Big HornRag Mega
Antibirth-only: Baby PlumBeelzeblubChimeraGreat GideonHornfelThe RainmakerReap CreepRotgutThe ScourgeThe SirenTuff TwinsWormwood

Posthumous Bosses
The AdversaryThe Blighted OvumThe BloatThe CageCarrion QueenThe GateThe HollowThe HuskLokiiMonstro IITeratomaThe Wretched

Afterbirth: The ForsakenThe FrailThe Stain
Antibirth-only: The HereticThe PileThe Visage

Alternative Bosses

Afterbirth †: Sisters Vis

ConquestWarFamineDeathPestilenceHeadless Horseman
Final Bosses
???IsaacIt LivesThe LambMega SatanMomMom's HeartSatan

Afterbirth: HushUltra Greed
Afterbirth †: Delirium
Antibirth-only: The Witness

Seven Deadly Sins
Seven Super Deadly Sins
Super EnvySuper GluttonySuper GreedSuper LustSuper PrideSuper SlothSuper WrathUltra Pride
Angels / Demons
KrampusGabrielUrielFallen Angels