The Binding of Isaac Wiki
For the character, see ???.

??? is the end boss of The Chest and added in V1.30 for the Wrath of the Lamb expansion. He is considered the game's true final boss.

His encounter is very similar to Isaac, except he is more powerful in that he fires more tears in retaliation.


Phase 1[]

Xxx form1

??? will appear lying down in the center of the room, crying on the floor. He shoots 12 high-velocity tears in a radial burst, some of them being purple and slightly homing, and will retaliate with streams of tears when hit, some of which may also be homing. He will also spawn Flies continuously.

Phase 2[]

Xxx form2

At 66% of his health, a light will shine on ???, and he jumps from the ground. He will then periodically shoot 4 large purple homing tears in all directions. He will still retaliate with tears when hit and will continue to spawn Flies.

Phase 3[]

XXX form3

Triggered near 33% of ???'s health. ??? will grow angel wings, smile, and start floating. White beams will be randomly shot down from the sky (similar to Crack The Sky and White Pony), Angel Babies will start spawning frequently (up to a maximum of 6), and the same homing projectiles from before will be shot in six directions at the same time. At this point ??? will no longer retaliate with tears when hit, and will spawn Flies less frequently.

Champion Variant[]

Eternal ??? acts almost the same as its normal counterpart, but he teleports more randomly and frequently than Eternal Isaac. He also slowly regenerates HP during Phase 1 like Isaac.

This variant was added in Eternal Edition and exclusively encountered in Hard Mode.


  • Using The Bible during or after the fight will instantly kill the player (similar to Isaac and Satan) unless they have The Wafer item.
  • Like in the Isaac fight, using items with a high fire rate (such as Technology 2) is dangerous in this fight, as ??? will retaliate with a large amount of tears upon each hit. This also applies to effects which apply damage rapidly, such as Mom's Knife.
  • Applying slow effects such as Little Gish or Spider Bite to ??? will not affect the speed of his homing tears, but will slow all normal tears.
  • Activating Mom's Bra or triggering the special effect of Mom's Contacts will prevent ??? from spawning enemies or attacking at all—including when damaged—for the duration of the effect.
  • ??? cannot be damaged by the Crack The Sky light beams, or by his own. However, any Angelic Babies in the fight can take a small amount of damage from the light beams.

Related Achievements[]

Hard Mode[]

  • Eternal Isaac Eternal Isaac - Defeat ??? with Isaac in Hard Mode.
  • Eternal Maggy Eternal Maggy - Defeat ??? with Maggy in Hard Mode.
  • Eternal Cain Eternal Cain - Defeat ??? with Cain in Hard Mode.
  • Eternal Judas Eternal Judas - Defeat ??? with Judas on Hard Mode.
  • Eternal Eve Eternal Eve - Defeat ??? with Eve on Hard Mode.
  • Eternal ??? Eternal ??? - Defeat ??? with ??? on Hard Mode.
  • Eternal Samson Eternal Samson - Defeat ??? with Samson in Hard Mode.


  • This boss is a reference to Ending 10, where Isaac finds ??? in the giant chest, showing how the boss fights represents Isaac suffocating inside of it.
  • ??? Is also a reference to BlueBaby, Edmund's Newgrounds name.
  • The music for this fight is the same as the Isaac fight, My Innermost Apocalypse.
  • In the second phase, ???'s tears are incorrectly shaped on his sprite, while in the third phase, his tears are falling down correctly.


  • Whenever he is curling up while in his third form, he might turn into Isaac for a single frame.
  • If you die after you beat him but have revive, entering the boss room will have both the boss and the chest present, but you can get to the chest to activate the ending.


In-Game Footage[]

Standard Bosses Dukeofflies fullThe Duke of FliesGemini fullGemini260x185-400px-Monstro.svgMonstroLarryjr fullLarry Jr.FistulaFistulaGurdy fullGurdyPeep FullPeepChubChubLoki fullLokiScolex fullScolexBlastocyst fullBlastocystTheFallen FullThe Fallen

Wrath of the Lamb DLC: 260x200-400px-Widow3WidowPin cleanPinMask of InfamyMask of InfamyGurdjrGurdy Jr.VS DaddyLonglegsDaddy Long Legs

Posthumous Bosses 285x230-MonstroII fullMonstro II

Wrath of the Lamb DLC: The HuskThe Husk260x220-The Hollow2The Hollow250x200-Teratoma.TeratomaLokii cutoutLokiiBlighted ovumBlighted OvumCarrionqueenThe Carrion QueenThe WretchedThe WretchedBc BloatThe Bloat

Alternate Bosses 287x265-Steven FullsizeStevenChub fullC.H.A.D.Gish fullGish

Wrath of the Lamb DLC: 200x300-400px-Triachnid boss portraitTriachnid

Harbingers 220x287-Isaac Vs famine edited- noobletkFamineBC PestilencePestilenceBC WarWarVSDeathDeath230x200-Headless HorsemanHeadless Horseman

Wrath of the Lamb DLC: BC ConquestConquest

Final Bosses 250x250-400px-MomMomMoms Heart FullMom's Heart250x250-ITLIVEScutoutIt LivesSatan FullSatan

Wrath of the Lamb DLC: Bc isaacIsaacBC xxx???