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

Dr. Fetus is an unlockable passive item.

Effects[]

  • Tears are replaced with bombs that explode approximately one second after being fired.
    • Removed in Afterbirth Each bomb deals 3 times the character's normal tear damage.
    • Added in Afterbirth / Removed in Repentance Each bomb deals 5 times the character's normal tear damage plus a flat 30 damage. The flat 30 is not affected by damage multipliers.
    • Added in Repentance Each bomb deals 10 times the character's normal tear damage for up to 60 damage, after which the bombs deal 30 flat damage plus 5 times the character's normal tear damage. This is effectively a soft damage limit. The flat 30 is not affected by damage multipliers.
    • Tears down: Delay * 2.5.
    • The range and shot speed stats both affect the velocity at which the bombs are fired out. Delay before the explosion is not affected by either.
    • Added in Repentance Bombs grow larger or smaller with tear size modifiers and deal no knockback to each other.

Notes[]

  • Removed in Repentance Dr. Fetus is a special item.
  • Dr. Fetus overrides multiple tear effect items, but benefit from some (but not all) bomb-enhancing effects like 15►Mr. Mega Mr. Mega.
    • Added in Afterbirth Many more synergies have been added, and all passive bomb modifiers affect Dr. Fetus.

Synergies[]

  • Added in Afterbirth †15►Apple! Apple! / Added in Afterbirth †15►Euthanasia Euthanasia: Damage multiplier may be applied to the non-flat damage without a visual difference. Euthanasia bombs do not retain the instant kill ability.
  • 15►Bobby-Bomb Bobby-Bomb: Bombs home in on enemies.
  • Added in Afterbirth15►Bomber Boy Bomber Boy: Bombs explode in a large cross-shaped pattern.
  • Added in Repentance15►Blood Bombs Blood Bombs: Bombs leave behind a pool of red creep.
  • Added in Repentance15►Brimstone Bombs Brimstone Bombs: The activation rate of the 15►Brimstone Brimstone lasers is dependent on luck. The chance is 11% at 0 Luck, increasing by 3% per luck. This maximizes at 100% at 29.67 luck and minimizes at 0% at -3.67 luck.
  • 15►Butt Bombs Butt Bombs: All bombs inherit the Butt Bomb effects.
    • Added in Repentance The activation rate is now random and dependent on luck. The chance is 20% at 0 Luck, increasing by 3% per luck. This maximizes at 100% at 26.67 luck and minimizes at 0% at -6.67 luck.
    • Unlike normal Butt Bombs, this synergy cannot heal Brownie, Clog, Colostomia, Dangle, or Dingle. Both the explosion and the cloud effect deal full damage.
  • Added in Afterbirth 15►Cricket's Body Cricket's Body: Bombs split outwards into 4 tiny bombs, which detonate almost immediately.
  • Added in Afterbirth15►Explosivo Explosivo: Bombs have a chance of sticking to an enemy. These bombs have the same appearance as Added in Afterbirth15►Sticky Bombs Sticky Bombs, but do not spawn spiders.
  • 15►Fire Mind Fire Mind / Added in Afterbirth 15►Hot Bombs Hot Bombs: Bombs leave behind a fire that damages enemies on contact after exploding, and bombs themselves deal 1 point of damage on contact.
  • Added in Repentance15►Ghost Bombs Ghost Bombs: The activation rate of the ghosts is dependent on luck. The chance is 34% at 0 Luck, increasing by 8% per luck. This maximizes at 100% at 8.25 luck and minimizes at 0% at -4.25 luck.
  • Added in Afterbirth †15►Haemolacria Haemolacria: Significantly increased tear delay. Isaac fires a large arcing tear reminiscent of a bomb that scatters into 3-5 bombs that explode simultaneously.
  • 15►Ipecac Ipecac: Bombs become 15►Bob's Curse Bob's Curse bombs. Isaac is immune to his bomb shots (not explosives or placed bombs) and the damage is massively increased, as the +40 damage from Ipecac is run through the damage multiplier of Dr. Fetus. Shots will also explode immediately on impact with enemies, rocks, or walls.
    • Added in Repentance The effect on damage now becomes a flat +2 bonus instead of +40. Bombs leave behind a cloud of poison gas that will poison enemies in contact with it aside from the main target. Isaac remains immune to the bomb shot.
    • Ipecac + 15►Cricket's Body Cricket's Body/15►Polyphemus Polyphemus/15►Sad Bombs Sad Bombs/Added in Afterbirth15►Scatter Bombs Scatter Bombs: Isaac is immune to the main bomb shot, but not to the explosive shrapnel.
      • Added in Repentance Isaac is now immune to the shrapnel bombs left by Cricket's Body, Polyphemus, and Scatter Bombs.
    • Ipecac + Added in Afterbirth15►Tech X Tech X: Isaac is immune to the main bomb shot, but not the explosions created by the laser ring.
  • 15►The Ludovico Technique The Ludovico Technique: Bomb can be controlled before exploding, similar to 15►Epic Fetus Epic Fetus. Isaac does not shoot bombs while controlling it.
  • Added in Afterbirth15►Monstro's Lung Monstro's Lung: Shoots 6 bombs that need to be fully charged before firing. The bombs detonate simultaneously.
  • 15►Mr. Mega Mr. Mega: Adds 25 flat damage to bomb explosions.
  • Added in Afterbirth15►Mysterious Liquid Mysterious Liquid: Exploding bombs leave behind a large pool of creep.
  • Added in Afterbirth15►The Parasite The Parasite: Upon exploding, bombs split into two other bombs, which explode almost immediately and deal a flat 24 damage.
    • Added in Repentance: The split bombs now deal a flat 40 damage.
  • Poison tears: Poison effects will give bombs a flat +50 damage. This is guaranteed by 15►Bob's Curse Bob's Curse, 15►Ipecac Ipecac, and 15►Scorpio Scorpio, and also has a chance to trigger from 15►The Common Cold The Common Cold or Pinky Eye Pinky Eye.
    • Added in Afterbirth No damage increase from poison. Poison bombs have a chance to trigger from Added in Afterbirth15►Serpent's Kiss Serpent's Kiss.
    • Added in Repentance Poison bombs leave behind a cloud of toxic gas that will poison enemies in contact with it aside from the main target.
  • 15►Polyphemus Polyphemus: Bombs increase in size and do increased damage.
    • Added in Afterbirth Bombs become 15►Mr. Mega Mr. Mega bombs. After they detonate, they leave behind a regular-sized bomb that deals a flat Added in Afterbirth / Removed in Repentance60 damage/Added in Repentance100 damage, much like a standard bomb.
  • 15►Proptosis Proptosis: Increases damage with no distance penalty.
  • 15►Remote Detonator Remote Detonator: Bombs can be detonated on command, making it easier to hit moving enemies. Unlike placed bombs, they will eventually detonate on their own.
  • Added in Repentance15►Rocket in a Jar Rocket in a Jar: Shoots rockets as normal tears.
  • Added in Afterbirth15►Sad Bombs Sad Bombs: Fires tears as normally placed Sad Bombs would.
    • Added in Repentance The activation rate is now random and dependent on luck. The chance is 11% at 0 Luck, increasing by 3% per luck. This maximizes at 100% at 29.67 luck and minimizes at 0% at -3.67 luck.
  • Added in Afterbirth15►Tech X Tech X: Bombs have a laser ring around them.
  • 15►Tough Love Tough Love: Damage multiplier may be applied to the non-flat damage without a visual difference.
    • Added in Afterbirth / Removed in Afterbirth †Tears that would have fired a tooth shot instead become a 15►Mr. Mega Mr. Mega bomb, adding a flat 25 damage and shaking the screen.
    • Added in RepentanceDamage multiplier may be applied to the non-flat damage without a visual difference.
  • Added in Repentance15►Uranus Uranus: Bombs freeze enemies upon killing them.

Interactions[]

  • 15►Anti-Gravity Anti-Gravity: Overridden by Dr. Fetus. Tear delay decrease is still applied.
  • Added in RepentanceBrain Worm Brain Worm: No effect on bombs.
  • 15►Brimstone Brimstone: Overridden by Dr. Fetus.
    • Added in Afterbirth / Removed in Repentance: Isaac continuously fires bombs while charging the blood laser. Overrides Azazel Azazel's blood laser.
  • 15►Chocolate Milk Chocolate Milk: Bombs can't be charged, but reduces Isaac's tear delay by 20%.
  • Removed in Afterbirth 15►Cricket's Body Cricket's Body: Bombs do not split. Range is greatly decreased.
  • Added in Afterbirth †15►Compound Fracture Compound Fracture: Bombs do not split. Stat changes still apply.
  • 15►Cursed Eye Cursed Eye: Overriden by Dr. Fetus.
  • 15►Epic Fetus Epic Fetus: Overrides Dr. Fetus.
  • Added in Afterbirth † The Forgotten The Forgotten: A live bomb will spawn on top of The Forgotten when he starts charging his attack. The Forgotten will toss bombs after releasing the charge; airborne bombs deal 1.5x his damage if they collide with an enemy with enough speed. Max distance is obtained with minimal charge. If the bomb explodes while charging, a normal ranged bone attack happens after releasing it. The melee attack is unaffected.
  • Added in Afterbirth15►Tear Detonator Tear Detonator: No effect.
  • Guppy: Explosions do not spawn flies.
  • Added in Repentance15►Immaculate Heart Immaculate Heart: Orbital tears do not become bombs.
  • Added in Afterbirth15►Kidney Stone Kidney Stone: Not recommended. The range decrease applies, but since the tear height stat doesn't affect Dr. Fetus' bombs, they spawn directly in front of Isaac, making self-damage very likely.
  • Added in Afterbirth †15►Lachryphagy Lachryphagy: Overridden by Dr. Fetus.
  • Added in Afterbirth †15►Lead Pencil Lead Pencil: Overridden by Dr. Fetus.
  • 15►A Lump of Coal A Lump of Coal: No damage increase.
  • Added in Afterbirth15►Marked Marked: Overridden by Dr. Fetus. Tear delay decrease is still applied.
    • Added in RepentanceCreates a target reticle at which the bombs continuously fire.
  • Removed in Afterbirth 15►Monstro's Lung Monstro's Lung: Same effect as 15►20/20 20/20, except retains fire rate.
    • 15►Ipecac Ipecac + 15►Monstro's Lung Monstro's Lung: Not recommended. Isaac is no longer immune to his own bombs, and since they explode as soon as they make contact, it makes self-damage very likely.
  • 15►Mom's Eye Mom's Eye: Grants a chance to shoot an extra bomb from the back of Isaac's head.
    • 15►Mom's Eye Mom's Eye + Added in Repentance15►Eye of the Occult Eye of the Occult: Bombs that spawn from Mom's Eye will try to move to where you're shooting making it very difficult to not get hit by your own explosions.
  • Removed in Afterbirth / Re-added in Repentance15►Mom's Knife Mom's Knife: Overrides Dr. Fetus.
    • Added in Afterbirth / Removed in Repentance Isaac continuously fires bombs while charging the knife.
    • 15►Mom's Knife Mom's Knife + Added in Afterbirth15►Incubus Incubus: The Incubus loses the ability to fire out bombs.
  • 15►My Reflection My Reflection: Not recommended, as bombs lose momentum and slide back towards Isaac, making self-damage very likely.
  • Added in Repentance15►Neptunus Neptunus: Overridden by Dr. Fetus.
  • Added in Repentance15►Ocular Rift Ocular Rift: No effect.
  • Added in Afterbirth †Ouroboros Worm Ouroboros Worm: Does not affect the trajectory of the bombs. Turns some bombs into homing bombs, similar to 15►Bobby-Bomb Bobby-Bomb.
  • Removed in Afterbirth 15►The Parasite The Parasite: No effect.
  • Piercing tears / Spectral tears: Using piercing/spectral tears is not recommended, as it will make aiming at and killing enemies or destroying obstacles more difficult.
  • Added in Afterbirth †15►Pop! Pop!: Overridden by Dr. Fetus.
  • 15►Soy Milk Soy Milk: Shoots rapid-fire mini bombs. Can create a line of bombs which can be difficult to avoid taking damage from. The explosions from bombs do not repel the other bombs, though.
  • Added in Afterbirth15►Sticky Bombs Sticky Bombs: Bombs stick to enemies, but enemies killed by the bomb will not spawn Blue Spiders.
  • Removed in Afterbirth / Re-added in Repentance15►Technology Technology: Overridden by Dr. Fetus.
    • Added in Afterbirth / Removed in Repentance Both fire normally.
  • Added in Afterbirth †15►Technology Zero Technology Zero: Overridden by Dr. Fetus.
  • Added in Repentance 15►Technology 2 Technology 2: The bombs are seemingly pushed forward by the laser, giving the appearance of much longer range.
  • 15►Tiny Planet Tiny Planet: Not recommended. Bombs fly uncontrollably around the player, making self-damage very likely.
  • Added in Afterbirth15►Tractor Beam Tractor Beam: After firing a bomb and moving, the bomb will have a homing-style effect towards the beam, but will not stay directly on the beam. Not recommended, as changing directions while firing will cause the bomb to reel back to Isaac at high speed, making self-damage very likely.
  • Added in Afterbirth †15►Trisagion Trisagion: Overridden by Dr. Fetus.

In-game Footage[]

Gallery[]

Trivia[]

  • The Dr. Fetus and Epic Fetus items are based on Dr. Fetus, the main villain in Super Meat Boy which is a game by Edmund McMillen (the creator of The Binding of Isaac: Rebirth).
  • This item is used in Demo Man (challenge #9).
  • In the original The Binding of Isaac, Dr. Fetus was unlocked by beating Mom's Heart five times instead of nine.

Seeds[]

PC Normal and hard modes only KP6M WZAJ (Treasure Room adjacent to spawn)

PC Normal mode only 9LCJ RQG8 (Treasure Room adjacent to spawn)

PC Added in Afterbirth † RX1E JBV9 (First floor Treasure Room)

PC Added in Repentance CXZG 2YD6 (Treasure room →↓ from spawn)

PC Added in Repentance DBEX HEBR (Tresure room adjacent to spawn)

PS4 Added in Afterbirth † Normal mode only BGGY NWTC (First Treasure Room)

PS4 Added in Afterbirth † Normal mode only LYCL LAAP (Treasure Room adjacent to spawn)

Bugs[]

Bug Bug! Removed in Afterbirth †The black ring generated from the synergy of Dr. Fetus and Tech X behaves as a Maw of the Void ring and may cause black hearts to drop.
Bug Bug! PC The 4 rockets generated from the synergy of Dr. Fetus, Rocket in a Jar and Angelic Prism tend to the right, no matter what is the starting firing direction.
Bug Bug! Even though having spectral tears will make bombs not collide with obstacles, if you shoot a bomb while on top of an obstacle, the bomb will collide with it, making it likely to take damage.


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