Isaac Rebirth

And I beheld, and, lo, in the midst of the throne and of the four beasts, and in the midst of the elders, stood a Lamb as it had been slain, having seven horns and seven eyes, which are the seven Spirits of God sent forth into all the earth.

–Revelation 5:6

The Lamb (ザ・ラム Za Ramu) is a final boss which resides in The Dark Room from The Binding of Isaac: Rebirth.

He is unlocked after beating Sheol 5 times.


The Lamb is a white skeletal-being with empty eye-sockets, an inverted cross-shaped mark on his forehead, and large, curly horns resembling those of a ram.


1st Phase

Boss TheLamb

1st phase.

The battle starts with The Lamb randomly moving around the room, firing various kinds of projectiles.
  • 3 curving lines of purple homing bullets
  • 3 to 5 lines of normal bullets
  • Multiple bullets that can split into 4 smaller projectile upon hitting the ground, much like Cricket's Body and Isaac as a boss.
  • A bunch of grey Ipecac in a similar fashion as Monstro.

Isaac would notice that The Lamb will take a deep breath before performing these attacks, however it is impossible to predict which one he is going to use.

Besides these, he can also fire 4 rotating Brimstone beams in the same pattern as Mom's Heart, and spawn up to 5 Attack Flies.

2nd Phase


2nd phase.

After wearing down his health to half, The Lamb's head separates from his body. The body stops in place and a blue flame (possibly his soul) appears on it, while the head continues fighting independently with the body.

The head continues to float around the room like Phase 1, and it can still use all attack patterns in phase 1, but also gains three new ones:

  • Fire 4 Brimstone beams diagonally rather than cardinally. These beams can still rotate.
  • Quickly charges at Isaac.
  • Fire a large bunch of purple homing shots in a similar fashion as Monstro.

The body stays completely stationary and randomly performs these attacks without even reacting to Isaac.

  • Fires a large bunch of purple shots in a similar fashion as Monstro. They look like homing tears but in fact it is just cosmetic.
  • Spawns up to 5 attack flies; If the head has been killed, it can spawn up to 25 flies.
  • A Curse of the Darkness will cover the floor for a long time after the body is killed.


  • The Lamb, as a final boss, is fairly easier to fight than ???. He cannot perform teleporting and does not summon so many flies.
  • However though, skills are still needed when Isaac are trying to dodge his bullets: Most type of his attack patterns will leave small rooms between his lines of bullets. Stay inside them and shoot at him is a clever strategy.
  • When The Lamb shoots homing projectiles by any means, a risking but effective way to dodge them is to stay close to him, which will make shots curve to Isaac much less.
  • Any items that grants protection to projectiles are beneficial.
  • In Phase 2, it is suggested that to defeat the head the first, since the body has no AI at all and attack flies will certainly not bother Isaac in any case as he have reached Dark Room and collected so many items.


  • The name "The Lamb" is most likely to be one of the many names of Jesus Christ, therefore it is possible that this boss represents Christ in some darker sense, speculated to be known as the "anti-christ".
  • The name "The Lamb" could also be a reference to the events in the biblical account of the Binding of Isaac, in which Abraham instead sacrifices a lamb after God saves Isaac. However, the word "ram" was used in that occasion, instead of "lamb".
  • The pre-fight graphic for The Lamb has his colors darker, while the in-game one has white bones.
  • From the V.S. screen, the floor The Lamb's standing on is a pentagram.
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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