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

The Fallen is a boss that can appear on any main path Chapter, with the prerequisite that Isaac has entered (not just encountered) a Devil Room through any methods, and with the following exceptions:

  • It cannot appear on the first floor.
  • It cannot appear on floors with predetermined bosses such as Mom, Mom's Heart, Isaac, etc.
  • Added in Repentance It also cannot appear on any of the alternate Chapters added in Repentance.

It is also encountered as the first phase of the Satan battle.


Phase 1[]

The Fallen moves randomly around the room in cardinal directions and can perform the following attacks:

  • Fires 3 projectiles in a spread followed by 4 projectiles in a spread in succession towards Isaac.
  • Increases its speed and chases Isaac. After taking a certain amount of damage, it halts and fires a 15►Brimstone Brimstone laser in each cardinal direction.

Phase 2[]

  • At 50% health, The Fallen splits into two smaller versions of itself. The two clones have identical behaviour.
    • It is possible to avoid the split if the Fallen takes a single hit doing more than 50% damage that causes poisoning or burning as the final one.

The Fallen deals a whole heart of contact damage in both phases.



  • Unlike other bosses, the item pool of the Fallen room is the Devil Room item pool.
    • Removed in AfterbirthLeaving and re-entering the room will change the item pool to the normal Boss Room item pool.
  • The Fallen can appear on the first floor during a Victory Lap if a Devil Room was entered during the previous lap. Even more rarely, it is possible to encounter him on a normal run if the first level was rerolled with 15►Forget Me Now Forget Me Now or a 5-pip dice room after visiting the Devil Room with a Joker card or a Red Chest.


  • The Fallen appeared in the Halloween Update for the original The Binding of Isaac.
  • Under normal circumstances, the Fallen is one of five bosses (the other four being Conquest, The Headless Horseman, Krampus, Baby Plum if spared, and Bumbino if he picks up enough coins) who drop or can drop active items upon defeat.
  • The Fallen is both visually and behaviorally similar to Krampus.
  • Despite the first phase of The Fallen having a death animation before splitting into clones, the clones themselves don't have a death animation.
  • Added in Afterbirth † Prior to Booster Pack #5, only Crusade would play when The Fallen appeared as Satan's first phase. As of the aforementioned Booster Pack, Cerebrum Dispersio also has a chance to play in this situation.
    • This also applies to when the Angels were fought normally (by bombing the Angel statues).
  • The Fallen is tied with Krampus as having the highest Stage HP among all entities in the game.

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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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