C Section

C Section is an unlockable passive item added in The Binding of Isaac: Repentance.

Effects[]

Isaac gains a short delay charge attack that fires homing, piercing, spectral fetus tears.
- The fetus tears do Damage equal to Isaac's, about 5 times per second, until they run out of Range.
- The fetuses will automatically fire when Isaac is at full charge, meaning the charge cannot be held.
- Charge time is quantized based on Tear Delay.
  - ${\text{Fetuses per Second}}={\frac {30}{Roundup({\text{Tear Delay}}\times 3)+1}}$
  - Fetuses per second is capped at 15.

Notes[]

Fetus size scales with damage.
The fetuses slow down upon contacting enemies, making its homing effect more powerful.

Synergies[]

Berserk!: Isaac can fire the fetuses on duration. The fetuses hold and attack with bone clubs that are identical to The Forgotten's one.
Brimstone / Azazel: Shoots 4 fetus tears along with the brimstone beam.
- Each additional beams created from Monstro's Lung or The Parasite, multi-shot effects including Loki's Horns, Eye Sore spawns four additional fetuses.
- Anti-Gravity: The fetuses spawn when the beam is being released. The fetuses do not spawn if Isaac is charging when the beam is being released.
- The Ludovico Technique: When combined with Brimstone, overrides C Section: fetuses no longer spawn.
Compound Fracture: Fetuses are skeletons that shoot splitting bone fragments when in contact with an enemy.
Cricket's Body: Fetuses drop four short-ranged tears when they hit the ground.
Dr. Fetus: The fetuses drop small bombs when they touch an enemy. The bomb's damage follows Dr. Fetus' damage calculation, based on half of the fetuses damage. A fetus can drop only one bomb.
- The fetuses' bombs do not benefit from Isaac's bomb effects such as Hot Bombs or Bobby-Bomb. However, they do benefit from Isaac's tear effects and have appearance of the corresponding bombs. For example, Hot Bombs from Fire Mind, Bobby-Bomb from Homing Tears. As such, Cricket's Body, The Parasite and Polyphemus leave a subsequent bomb or bombs, and Mysterious Liquid leaves a creep.
- Dr. Fetus + Ipecac: The fetuses explode before dropping any bomb.
- Dr. Fetus + Haemolacria: Fetuses will both drop a bomb on touching an enemy and burst into multiple small bombs upon hitting the ground.
Explosivo: Some Fetuses stick to enemies, expand then explode. However, they do not inflict their contact damage while sticking.
- Explosivo + Mom's Knife: The knives from fetuses with Explosivo's effect create exploding tears for each damaging tick. The explosions from a knife deal 60 + half of the fetus' damage which held it.
- Explosivo + Berserk! / Spirit Sword / The Forgotten / Tainted Forgotten: The clubs/swords from fetuses with Explosivo's effect create exploding tears for each damaged enemy from their attack. The explosions from a club/sword deal 60 + the damage its attack dealt.
- Explosivo + Technology: The lasers from fetuses with Explosivo's effect create exploding tears for each damaged enemy from their attack. The tears inherit the fetuses' property including laser attacks, which can create another tears. The tears from a laser deal 60 + the laser's damage they originated, and their lasers deal the same as the lasers they originated. Fetuses can fire lasers while sticking to an enemy and spin, while tears do not spin.
- Explosivo + Tech X: The laser rings from fetuses with Explosivo's effect create exploding tears for each damaging tick. The explosions from a ring deal 60 + the ring's damage.
The Forgotten / Tainted Forgotten: Fetuses are skeletons that attack with bone clubs in addition to contact damage. The fetuses from Tainted Forgotten deal 80% of their normal damage.
- With Brimstone: Spawns a brimstone ball along with a fetus. Shots are fired automatically as the charge completes.
- With Mom's Knife: Fetuses hold knives instead of bone clubs and no longer perform the swing attacks.
- With Monstro's Lung Tears remain unchanged, the forgotten will fire a burst attack alongside the fetus. No effect on the soul.
- With Technology: Fetuses perform laser attacks and enhanced bone club attacks separately, causing more damage.
Godhead: Fetuses have a glowing aura around them, but the aura cannot damage the enemy in contact with the fetuses.
Ipecac: The fetuses explode on impact dealing its contact damage, which is often massively increased from the item.
Haemolacria: Fetuses explode into a burst of tears when they hit the ground.
Jacob's Ladder: Fetuses zap nearby enemies.
Luck-based tear effects (e.g. Holy Light / Knockout Drops): If a fetus has the effect, the fetus cause the effect for each damaging tick.
- Little Horn: Still only two hands can appear at once.
- Ocular Rift: The rifts spawn only once per fetus.
- Luck-based tear effects + Mom's Knife: If a fetus has the effect, the knife also causes the effect for each damaging tick. If not, the knife has chance to cause the effect based on Isaac's Luck for each damaging tick.
- Luck-based tear effects + Berserk! / Spirit Sword / Technology / The Forgotten / Tainted Forgotten: If a fetus has the effect, each attack also causes the effect.
- Luck-based tear effects + Tech X: If a fetus has the effect, the laser ring also causes the effect for each damaging tick.
Mom's Knife: Fetuses hold small knives in their front, causing extra damage. The knife deals twice of Isaac's Damage just as when it is held by Isaac and their size scales with the fetuses' size. Any additional copy of the item causes Isaac to shoot more fetuses.
- Mom's Knife + Proptosis: The knives shrink along with the fetuses, but they retain their tripled damage.
Mucormycosis: Some Fetuses stick to enemies, expand then burst. However, they do not inflict their contact damage while sticking. Unlike normal spores, the fetuses from the burst can home into the enemy they burst from.
- Mucormycosis + Mom's Knife: The knives from fetuses with Mucormycosis' effect create spores for each damaging tick. Their knives deal twice of Isaac's Damage, same as the ones they originated.
- Mucormycosis + Berserk! / Spirit Sword / The Forgotten / Tainted Forgotten: The clubs/swords from fetuses with Mucormycosis' effect create spores for each damaged enemy from their attack. The fetuses from the burst also hold clubs/swords which are able to create another wave of spores. The damage of attacks are calculated based on half of the spores' flat 3.5 damage.
  - Berserk! / The Forgotten: Their swings deal 10.5 damage.
  - Tainted Forgotten: Their swings deal 8.4 damage.
  - Spirit Sword: Their swing attacks/spin attacks/projectiles deal 8.75/24/11 damage.
- Mucormycosis + Technology: The lasers from fetuses with Mucormycosis' effect create spores for each damaged enemy from their attack. The spores inherit the fetuses' property including laser attacks, which can create another spores. The fetuses from the burst also has laser attacks which are able to create another wave of spores. Their laser attacks deal 3.5 damage, based on the spores' flat 3.5 damage. Fetuses can fire lasers while sticking to an enemy and spin, while spores do not spin.
- Mucormycosis + Tech X: The laser rings from fetuses with Mucormycosis' effect create spores for each damaging tick. The fetuses from the burst are also surrounded by laser rings which are able to create another wave of spores. Their rings deal 1.75 damage, based on half of the spores' flat 3.5 damage.
The Parasite: Fetuses fire short-ranged tears constantly while in contact with an enemy.
Polyphemus: Grants +5 flat damage with no fire rate down.
Sinus Infection: Some Fetuses stick to enemies. However, they only do the Sinus Infection damage ticking and often result in dealing much less damage.
- Sinus Infection + Mom's Knife: The knives from fetuses Sinus Infection's effect create boogers for each damaging tick. The boogers from a knife deal half of the fetus' damage which held it per tick.
- Sinus Infection + Berserk! / Spirit Sword / The Forgotten / Tainted Forgotten: The clubs/swords from fetuses with Sinus Infection's effect create boogers for each damaged enemy from their attack. The boogers from a club/sword deal half of the fetus' damage which held it per tick.
- Sinus Infection + Technology: The lasers from fetuses with Sinus Infection's effect create boogers for each damaged enemy from their attack. The boogers inherit the fetuses' property including laser attacks, which can create another boogers. The boogers from a laser deal the laser's damage, so does their lasers. Fetuses can fire lasers while sticking to an enemy and spin, while boogers do not spin.
- Sinus Infection + Tech X: The laser rings from fetuses Sinus Infection's effect create boogers for each damaging tick. The boogers from a ring deal the ring's damage per tick.
Spirit Sword: Fetuses hold small swords and repeat the swing attack and the charged spin attack as they travel. The damage calculation is based on half of the fetus' damage. On base Range, they have just enough time to perform the attacks twice. The sword's size scales with the fetus' size.
- Spirit Sword + Berserk! / Mom's Knife / The Forgotten / Tainted Forgotten: The fetuses hold swords and do not benefit from the others.
- Spirit Sword + Proptosis: Although the attacks' damages diminish along with the fetus, the projectile from the sword does not lose its damage over range.
Tainted Azazel: Shoots 2 fetus tears along with his thin brimstone beam.
Tech.5 / Technology 2: Both fire at the same time.
Technology Zero: Fetuses are connected with electricity.
Tech X: Fetuses are surrounded by a laser ring that deals half of their damage. The ring's size scales with the fetus' size.
- Tech X + Brimstone: The laser rings do not change into brimstone rings. The Brimstone has no effect unless combined with other additional items.
- Tech X + Proptosis: The rings shrink along with the fetuses, but they retain their tripled damage.
Technology: Fetuses rapidly shoot a short-ranged laser based on their damage when facing enemies.
- Technology + Cricket's Body: Split tears created from the end of the laser inherit the effects of fetus tears including laser attacks from Technology, but they do not create another split tears.
- Technology + Lachryphagy: Fetuses can feed on either other fetuses or Lachryphagy tears which their laser attacks create. Fed fetuses shoot stronger lasers, creating powerful Lachryphagy tears.
- Technology + Pop!: Pop! tears created from the end of the laser inherit the effects of fetus tears including laser attacks from Technology, which can create another Pop! tears.
- Technology + Proptosis: Although the laser's damage diminishes along with the fetus, it does not lose its damage over range.
- Technology + Spirit Sword: Fetuses hold lightsabers and perform laser attacks and enhanced sword attacks separately, causing more damage.
My Reflection: Fetuses travel a short distance, then reverse direction and return to Isaac.
Dead Eye: Damage boost is granted once a fetus hits an enemy (once per fetus) and is reset when a fetus does not hit anything before going down, using the same rule to determine whether the damage boost is reset or not.
- This makes for a great synergy since the fetuses are homing and stay up much longer than regular tears.

Interactions[]

C Section overrides:
- Cursed Eye
- Chocolate Milk
- Evil Eye
- Eye of the Occult (besides stat changes)
- The Ludovico Technique
- Monstro's Lung
- Neptunus
- Tractor Beam
- Trisagion
Anti-Gravity: Fetuses will begin stuck in-place as expected, but will ignore this behavior if there are nearby enemies, in which case they will home in and chase them.
BFFS!: No effect.
Epic Fetus: Overrides C Section.
Fire Mind: The fetuses can explode and leave fires before they run out of Range, which can result in inflicting less damage.
Eye of Belial: Fetuses' appearances change into Eye of Belial tears when passing through an enemy, but they retain their effects.
Flat Stone: Fetuses only bounce after going rather far or damaging enemies for long enough.
Knockout Drops: Fetuses affected by it have the appearance of a fist, but they retain their effects.
Lachryphagy: Burst tears appear to be fetuses, but they do not retain Homing or Piercing effect from C Section.
Multidimensional Baby: Fetuses' appearances change into normal tears when passing through Multidimensional Baby, but they retain their effects.
Pop!: Fetuses' movements do not extend their lifespan, it is still limited by Range. Fetuses do not fall after bouncing off of each other 8 times.
Sad Bombs / Tammy's Head: Fires normal tears.
Tear Detonator: Fetuses split into normal tears.

In-game Footage[]

Gallery[]

C Section has a variety of sprite sheets for its fetus shots, depending on which character is using it:

Image	Notes
	Default; appearance when fired by the large majority of characters.
	Azazel, Lilith, Tainted Azazel, Tainted Lilith, any character that holds Brimstone or a number of other Devil-related items.
	???, The Soul, Tainted ??? (albeit heavily brown tinted), or any character that holds Anti-Gravity or Neptunus.
	Dark Judas or Tainted Judas.
	Unknown/unimplemented. ^{[Check ingame]} This skin may be meant for any character that holds The Common Cold or other poison-related items, but this merely tints the fetuses a darker shade of green.
	Keeper, Apollyon, Tainted Lost, Tainted Keeper, or Tainted Apollyon.
	Esau, or any character that holds SMB Super Fan.
	The Forgotten (not The Soul), Tainted Forgotten or any character that holds Compound Fracture.
	The Lost, Dead Tainted Lazarus, Tainted Jacob in his ghost form, or any character that holds Sacred Heart.

Trivia[]

A Caesarean Section, or C Section for short, is a surgical procedure by which a baby is delivered through an incision in the mother's abdomen.
The fetus shots themselves resemble Unborns.
Prior to v1.7.5, this item had no effect other than changing Isaac's appearance and appeared in no item pools. Nonetheless, obtaining it was still required in order to unlock the Dead God Achievement.
- It was obtainable via Death Certificate and Spindown Dice, or as a starting item for Eden / Tainted Eden.
Edmund McMillen said on Twitter that C Section was a passion project of an item that was too complex to implement explaining it not having been implemented at launch, that Kilburn obsessively worked on it and its hard-coded synergies himself until it was eventually added at a later update.

Seeds[]

PC JAQM BBZ9 ( Treasure Room adjacent to spawn)

XboxOne GBXZ SM7M ( Treasure Room adjacent to spawn) Requires 1 reroll The D6

Bugs[]

Bug!	There's no idle animation for C Section's costume, so Isaac (and every other character other than Lilith) will always appear to be walking when charging a shot, even when stationary.

Bug!	Tainted ??? does not have a costume assigned for C Section (despite ??? having one), and nonetheless always appears to be walking while charging a shot, even when stationary (see previous bug).

Bug!	While Isaac has both C Section and Incubus (including Lilith's inherent Incubus), Incubus' flying animation does not play while not firing; it floats around with no animation at all. The animation plays normally while firing.