Binding of Isaac: Rebirth Wiki
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Bob's Rotten Head is an activated item.

Effects[ | ]

  • Upon use, Isaac holds a poison BombBomb which can be thrown in the cardinal directions and explodes on impact.
    • The bomb can fly across the room for 9.5 tiles before falling to the ground and explode.
    • (except in Repentance) The explosion deals a flat 50 + Isaac's tear damage and poisons affected enemies.
    • (in Repentance) The explosion deals a flat 185 + Isaac's tear damage and leaves behind a gas cloud that poisons affected enemies. The poison cloud deals 5 damage.
    • (in Rebirth) The poison deals 6 or 8 points of damage over time.
    • (except in Rebirth) The poison deals 3 times Isaac's tear damage over time.
  • (except in Rebirth) This item belongs to the BobBob set. Collecting three items from this set will transform Isaac into Bob.

Notes[ | ]

  • This item can drop from SlothSloth.
  • Bob's Rotten Head is affected by many tear modifiers and some bomb modifiers. Notable exceptions and precautions are listed below.
  • Bob's Rotten Head passes through BeggarBeggars, Slot MachineSlot Machines, or Blood Donation MachineBlood Donation Machines, but can destroy them with the blast damage if it impacts anything nearby.
  • Can open open Secret RoomSecret Rooms, Super Secret RoomSuper Secret Rooms, or destroy rocks like any other bomb.
  • Certain interactions require Flat Stone to be effective or work.

Interactions[ | ]

  • (except in Rebirth)Bob's BladderBob's Bladder / Collectible Bobby-Bomb iconBobby-Bomb / (except in Rebirth)Collectible Bomber Boy iconBomber Boy / (in Afterbirth † and Repentance)Collectible Fast Bombs iconFast Bombs / (in Repentance)Collectible Rocket in a Jar iconRocket in a Jar / (except in Rebirth)Collectible Scatter Bombs iconScatter Bombs / Collectible Mr. Mega iconMr. Mega: No effect.
  • Collectible Bob's Curse iconBob's Curse:
    • (except in Repentance) No effect.
    • (in Repentance) The explosion leaves behind a poison cloud.
  • (in Repentance)Collectible Blood Bombs iconBlood Bombs: Bob's Rotten Head leaves a pool of red creep on the ground after each explosion.
  • (in Repentance)Collectible Book of Virtues iconBook of Virtues: Spawns wisps in the middle ring. The wisps shoot arcing green tears with decreased range, with a 7.5% chance of firing an explosive, poisonous tear.
  • (except in Rebirth)Collectible Car Battery iconCar Battery: No effect.
  • (in Afterbirth † and Repentance)Collectible Compound Fracture iconCompound Fracture: Spawns 1-3 smaller heads that explodes for half the damage of the bigger one.
  • (except in Rebirth)Collectible Continuum iconContinuum:
    • (in Afterbirth and Afterbirth †) Bob's Rotten Head can now travel through walls and appear out of the opposite wall, similar to a portal-type mechanic.
    • (in Repentance) No longer travels through the wall; instead he bounces off it, like with Collectible Rubber Cement iconRubber Cement, and then travels for the rest of its duration at a slower speed and then explodes.
  • Collectible Cricket's Body iconCricket's Body: Spawns four smaller heads that explodes for half the damage of the bigger one.
  • (except in Rebirth)Collectible Explosivo iconExplosivo / (except in Rebirth)Collectible Sticky Bombs iconSticky Bombs:
    • (in Afterbirth and Afterbirth †) If Bob's Rotten Head sticks to an enemy (sometimes with Explosivo, always with Sticky Bombs), the explosion is delayed but will deal 110 damage.
    • (in Repentance) No longer sticks to enemies.
  • (in Repentance)Collectible Eye of the Occult iconEye of the Occult: Isaac can control the mid-flight direction of the head, however its air-time is not increased.
  • (in Repentance)Collectible Flat Stone iconFlat Stone: Will cause Bob's Rotten Head to bounce once, exploding twice and leaving two gas clouds.
  • Collectible Fire Mind iconFire Mind: Creates fire when the head lands.
  • Collectible Godhead iconGodhead: Creates a Godhead aura around the head and applies homing effect when thrown.
  • (in Afterbirth † and Repentance)Collectible Haemolacria iconHaemolacria: When the head lands, tears are fired.
  • (except in Rebirth)Collectible Holy Light iconHoly Light: Has a chance to throw a Holy Light head that spawns a damaging beam of light dealing ((except in Repentance)4x) (in Repentance)3x the explosion damage when it hits an enemy.
  • Homing tears: Homing is applied to the thrown head as well.
  • (except in Repentance) Spectral tears: The head will pass through obstacles and walls, meaning it will no longer destroy obstacles or open secret rooms on impact. They can still be opened if the user stands back far enough to let the thrown head run out of range.
    • (in Repentance) The head will slightly bounce off of walls with spectral tears. It still passes through obstacles.
  • (in Afterbirth † and Repentance)Collectible Lachryphagy iconLachryphagy: The head act as a tear, dividing itself if enough time has passed and interacting with other tears. The five heads coming from the main head deal half damage. Feeding a head with another increases damage by the amount of damage Isaac has. If a tear is fed with a head, the tear will gain the head's damage.
  • Collectible The Parasite iconThe Parasite: Causes two smaller tears to appear that explodes for half the damage of the head. Tears do not look like the normal head.
  • Collectible Rubber Cement iconRubber Cement: Causes the head to bounce off of rocks and walls.
  • Collectible Tiny Planet iconTiny Planet: When used, Bob's Rotten Head will orbit the player similar to a tear.
  • (in Afterbirth † and Repentance)Collectible Trisagion iconTrisagion:
    • (in Afterbirth †) Not recommended as it explodes multiple times before reaching its target, dealing explosive damage and knockback to Isaac.
    • (in Repentance) Shoots a white blast of light instead of the head that pierces through enemies, and causing explosions when it contacts an enemy (if not killing it at the first tick), an obstacle, or when it runs out of range. One tick of the beam deals 33% of Bob's Rotten Head's damage to enemies, but the resulting explosion every tick deals full damage.
  • (in Repentance)Collectible Uranus iconUranus: Enemies are frozen when dying to Bob's Rotten Head.
  • Worm Trinkets: Bob's Rotten Head is affected by trinkets like Hook WormHook Worm and Wiggle WormWiggle Worm the same way tears are.

In-game Footage[ | ]

Unlockable Achievements[ | ]

Gallery[ | ]

Trivia[ | ]

  • The item's appearance is similar to Boss Pestilence ingamePestilence's head.
  • SlothSloth's full name is Bob Sloth, revealed in a QnA. Because Sloth drops this item, it may be his head.

Bugs[ | ]

Bug Bug! Although Collectible Bob's Rotten Head iconBob's Rotten Head works normally with Collectible Butt Bombs iconButt Bombs and (except in Rebirth)Collectible Bomber Boy iconBomber Boy has no effect with it, their combination drops the explosion damage by 50%.


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