Isaac (Boss)

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Boss Isaac name.png
Boss versus screen image
Base HPStage HP
Table dividing line 1.png
Ingame Appearance
In-game appearance

Entity ID
Table dividing line 2.png
Found In
Stage Cathedral icon.png
Stage The Void icon.png
Table dividing line 3.png
Dropped Items
Final Boss Chest (The Chest)
Disambig.png This article is about the boss. For the character, see Isaac.

Isaac is the boss of the Cathedral Cathedral, and the final boss of Ending 13.

Behavior[edit | edit source]

Isaac lies on the ground in the middle of the room does not begin attacking until he takes damage.
During all three of Isaac's phases, he continuously shoots multiple projectiles in the player's direction at fixed intervals. After taking enough damage, he begins to shoot double projectiles and triple projectiles.

Phase 1[edit | edit source]

Isaac remains stationary on the ground and performs the following attacks:

  • Shoots 10 lines of projectiles in every direction.
  • Shoots 8 groups of projectiles in a that curve back towards him.
  • Shoots 8 groups of long-range spinning projectiles along with 10 slightly curved lines of shorter-range projectiles in every direction.

Phase 2[edit | edit source]

Isaac stands up but remains stationary and performs the following attack:

  • Isaac alternates between two projectile patterns:
    • Shoots 4 projectiles in a cross pattern, which splits into four short-ranged projectiles after a short time, similar to 15►Cricket's Body Cricket's Body.
    • Shoots 8 projectiles in all directions.

Independently of his projectile attack:

Phase 3[edit | edit source]

Isaac grows a pair of angelic wings and is no longer stationary, moving towards where the player is predicted to go with short dashes. During which he also performs the following attacks:

  • Teleports off-screen and summons 15►Crack the Sky Crack the Sky beams to cover the screen, starting from one of the top corners to the opposite bottom corner. After teleporting back on-screen, he shoots the 10 lines of projectiles from the first phase. He always performs this attack at the start of this phase and repeats this process every time he takes a certain amount of damage.
    • Added in Repentance Shadows indicate ahead of time where the beams strike.
  • Can perform all projectile patterns from the first phase.

Gallery[edit | edit source]

Unlockable Achievements[edit | edit source]

  • PONG
    Added in Afterbirth † PONG - Defeat Isaac 5 times.

Notes[edit | edit source]

Trivia[edit | edit source]

  • Isaac was added in the Wrath of the Lamb DLC for the original The Binding of Isaac.
  • Isaac, along with ???, teleport away upon defeat and do not "die".
  • Isaac's expression as he changes phases during the fight goes from a somber, scared tone to him smiling in his third phase. This supports the theory that Isaac has made peace with himself and realized what he must do, as seen through the multiple endings of the game.
  • The music that plays during this boss fight is titled Infanticide.[1] The term infanticide refers to the act of killing an infant or newborn.
    • In the original Wrath of the Lamb DLC, the song is was My Innermost Apocalypse.
  • During his first phase, Isaac makes the same crying sound as Mulligans. This also applies to ???.

Bugs[edit | edit source]

Bug Bug! Added in Afterbirth † The Angelic Babies always spawn in the bottom center of the room at the same position.

References[edit | edit source]

Bosses Boss Monstro.png
Chapter 1
Stage The Basement icon.pngStage The 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 The Caves icon.pngStage The 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 The 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 The 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 The 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
Achievements Achievements Attributes Attributes Bosses Bosses TarotCard.png Cards and Runes Challenges Challenges Chapters Chapters
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