Dr. Fetus

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) Dr. Fetus has two formulas for calculating the damage it does. At first, each bomb deals 10 times the character's normal tear damage. If the previous formula would lead to the bombs doing more than 60 damage, the bombs instead deal 5 times the character's normal tear damage plus a 30 flat damage. 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.
    • (Added in Afterbirth †) Angelic Prism Split bombs still deal knockback to eachother.

Notes

• (Removed in Repentance) Dr. Fetus is a special item.
• R U A Wizard? Does not affect Dr. Fetus.
• Dr. Fetus overrides multiple tear effect items, but benefit from some (but not all) bomb-enhancing effects like Mr. Mega.
  • (Added in Afterbirth) Many more synergies have been added, and all passive bomb modifiers affect Dr. Fetus.
• Dr. Fetus bombs deal half a heart of damage to Isaac. Other explosion damage is not affected.
  • Self-damage is increased to a full heart if the bomb would deal 85 damage or more. This includes effects from bomb modifiers, not just raw base damage.

Synergies

• (Added in Afterbirth †) Apple! / (Added in Afterbirth †) Euthanasia: Damage multiplier may be applied to the non-flat damage without a visual difference. Euthanasia bombs do not retain the instant kill ability.
• Bobby-Bomb: Bombs home in on enemies.
  • (Added in Afterbirth)Homing Tears: Bombs home in on enemies.
• (Added in Afterbirth) Bomber Boy: Bombs explode in a large cross-shaped pattern.
  • Bomber Boy + Cricket's Body / The Parasite / Polyphemus / (Added in Afterbirth) Scatter Bombs: The subsequent bomb or bombs explode in a cross-shaped pattern.
• (Added in Repentance) Blood Bombs: Bombs leave behind a pool of red creep.
• (Added in Repentance) Brimstone Bombs: The activation rate of the Brimstone lasers is 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.
• Butt Bombs: All bombs inherit the Butt Bomb effects.
  • (Added in Repentance) The activation rate is 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) Cricket's Body: Bombs split outwards into 4 tiny bombs, which detonate almost immediately.
  • (Added in Repentance)The split bombs deal a flat 35 damage.
• (Added in Afterbirth) Explosivo: Bombs have a chance of sticking to an enemy. These bombs have the same appearance as (Added in Afterbirth) Sticky Bombs, but do not spawn spiders.
• (Added in Repentance) Eye Sore: When Isaac shoots, he has a chance to fire 1-3 additional bombs in random directions.
• Fire Mind / (Added in Afterbirth) Hot Bombs: Bombs leave behind a fire that damages enemies on contact after exploding, and bombs themselves deal (Added in Afterbirth / Removed in Repentance)1 point of damage/16 damage on contact.
• 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.
• Godhead: Does not give bombs the damaging aura, but does give them the homing effect.
• (Added in Afterbirth †) Haemolacria: Significantly increased tear delay. Isaac fires a large arcing tear reminiscent of a bomb that scatters into 3-5 bombs that explode simultaneously. The split bombs deal half of Dr. Fetus' damage calculation based on the main tear's damage.
  • Haemolacria + Sad Bombs: Sad bombs from Haemolacria tears shoot 10 Haemolacria tears, which then scatters into bombs without Sad Bombs' property.
• Ipecac: Bombs become 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, poops, angel statues, devil statues, or walls.
  • The effect on damage 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.
  • Ipecac + Cricket's Body / The Parasite / Polyphemus / Sad Bombs / Scatter Bombs: Isaac is immune to the main bomb shot, but not to the explosive shrapnel.
    • Isaac is immune to the shrapnel bombs left by Cricket's Body, The Parasite, Polyphemus, and Scatter Bombs.
  • Ipecac + Tech X: Isaac is immune to the main bomb shot, but not the explosions created by the laser ring.
• The Ludovico Technique: Bomb can be controlled before exploding, similar to Epic Fetus. Isaac does not shoot bombs while controlling it.
• Monstro's Lung: Shoots 6 bombs that need to be fully charged before firing. The bombs detonate simultaneously.
• Mr. Mega: Adds 25 flat damage to bomb explosions.
• Mysterious Liquid: Exploding bombs leave behind a large pool of creep.
• The Parasite: Upon exploding, bombs split into two other bombs, which explode almost immediately.
  • The split bombs deal a flat 24 damage/ 40 damage.
• Piercing tears: Bombs deal 2.5x Isaac's damage to enemies when passing through them.
• Poison tears: This is guaranteed by Bob's Curse, Ipecac, and Scorpio, and also has a chance to trigger from The Common Cold, (Pinky Eye) Pinky Eye or Serpent's Kiss.
  • Poison effects will give bombs a flat +50 damage.
  • Poison bombs leave behind a cloud of toxic gas that will poison enemies in contact with it aside from the main target.
• Polyphemus: Bombs increase in size and do increased damage.
  • Bombs become Mr. Mega bombs. After they detonate, they leave behind a regular-sized bomb that deals a flat 60 damage/100 damage, much like a standard bomb.
• Proptosis: Distance penalty does not apply.
  • Damage for Dr. Fetus' damage calculation is tripled.
• 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.
• Rocket in a Jar: Shoots rockets.
  • Piercing tears: Rockets do not pierce through enemies. However, they deal both piercing damage and explosion damage on impact with an enemy.
• Sad Bombs: Fires tears as normally placed Sad Bombs would.
  • The activation rate is 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.
• Scatter Bombs: Bombs split into 2-4/ 4-5 tiny bombs. The bombs deal half damage of the bomb it came from.
  • The activation rate is random and 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.
• Tech X: Bombs have a laser ring around them.
  • Tech X + Cricket's Body / The Parasite / Polyphemus / Scatter Bombs: The subsequent bomb or bombs do not have the laser ring.
• Tough Love: Damage multiplier may be applied to the non-flat damage without a visual difference.
  • Tears that would have fired a tooth shot instead become a Mr. Mega bomb, adding a flat 25 damage and shaking the screen.
  • Damage multiplier may be applied to the non-flat damage without a visual difference.
• Uranus: Bombs freeze enemies upon killing them.

Interactions

• Anti-Gravity: Overridden by Dr. Fetus. Tear delay decrease is still applied.
• (Brain Worm) Brain Worm: No effect on bombs.
• Brimstone: Overridden by Dr. Fetus. Beams can still appear from other sources such as Sad Bombs.
  • Isaac continuously fires bombs while charging the blood laser. Overrides (Azazel) Azazel's blood laser.
• Chocolate Milk: Bombs can't be charged, but reduces Isaac's tear delay by 20%.
• Cricket's Body: Bombs do not split. Range is greatly decreased.
• Compound Fracture: Bombs do not split. Stat changes still apply.
• Cursed Eye: Overridden by Dr. Fetus.
• Epic Fetus: Overrides Dr. Fetus.
• (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.
• Tear Detonator: No effect on bombs.
• (Guppy) Guppy: Explosions do not spawn flies.
• Immaculate Heart: Orbital tears do not become bombs.
• Kidney Stone / Number One / Pluto: The bombs lose almost all of their range, and cannot be improved by range ups, shot speed or any other method.
• 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. The effect can be mitigated with range ups.
• Lachryphagy: Dr. Fetus bombs are not affected. Lachryphagy tears can still appear from other sources such as Sad Bombs.
• Lead Pencil: Overridden by Dr. Fetus.
  • Not recommended. Every fifteenth shot will cause a barrage of short-ranged tears, which blocks the path of the bomb and can harm Isaac as the result.
• A Lump of Coal: No damage increase.
• Marked: Overridden by Dr. Fetus. Tear delay decrease is still applied.
  • Creates a target reticle at which the bombs continuously fire.
• Monstro's Lung: Same effect as 20/20, except retains fire rate.
  • Ipecac + 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.
• Mom's Eye: Grants a chance to shoot an extra bomb from the back of Isaac's head.
  • Mom's Eye + 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.
• Mom's Knife: Overrides Dr. Fetus. Knives can still appear from other sources such as Sad Bombs.
  • Isaac continuously fires bombs while charging the knife.
  • Mom's Knife + Incubus: The Incubus loses the ability to fire out bombs.
• My Reflection: Not recommended, as bombs lose momentum and slide back towards Isaac, making self-damage very likely.
• Neptunus: Overridden by Dr. Fetus.
• Ocular Rift: No effect.
• (Ouroboros Worm) Ouroboros Worm: Does not affect the trajectory of the bombs. Turns some bombs into homing bombs, similar to Bobby-Bomb.
• The Parasite: No effect.
• Piercing tears: Not recommended, as it will make killing enemies more difficult.
• Pop!: Dr. Fetus bombs are not affected. Pop! tears can still appear from other sources such as Sad Bombs.
• 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.
  • Soy Milk + The Parasite: Not recommended. Side bombs will repel the mini-bombs, making it very difficult to avoid taking damage.
• Spectral tears: Not recommended, as it will make destroying obstacles more difficult.
• Sticky Bombs: Bombs stick to enemies, but enemies killed by the bomb will not spawn Blue Spiders.
• Technology: Overridden by Dr. Fetus. Lasers can still appear from other sources such as Sad Bombs.
  • Both fire normally.
• Technology Zero: Dr. Fetus bombs do not generate electricity. Tears from other sources such as Sad Bombs can still generate electricity.
• Technology 2: The bombs are seemingly pushed forward by the laser, giving the appearance of much longer range.
• Tiny Planet: Not recommended. Bombs fly uncontrollably around the player, making self-damage very likely.
• 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.
• Trisagion: Overridden by Dr. Fetus. Trisagion blasts can still appear from other sources such as Sad Bombs.