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 75% of Isaac's Damage, 3.75 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.
		- Fetuses per Second
		=

		30

		R
		o
		u
		n
		d
		u
		p
		(
		Tear Delay
		×
		3
		)
		1

		{\displaystyle \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

* : Isaac can fire the fetuses on duration. The fetuses hold and attack with bone clubs that are identical to  The Forgotten's one.
* /  Azazel: Shoots 4 fetus tears along with the brimstone beam.
	+ Each additional beams created from  or , multi-shot effects including ,  spawns four additional fetuses.
	+ : The fetuses spawn when the beam is being released. The fetuses do not spawn if Isaac is charging when the beam is being released.
	+ : When combined with , overrides : fetuses no longer spawn.
* : Fetuses are skeletons that shoot splitting bone fragments when in contact with an enemy.
* : Fetuses drop four short-ranged tears when they hit the ground.
* : 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.
* : 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  or . However, they do benefit from Isaac's tear effects and have appearance of the corresponding bombs. For example,  from ,  from Homing Tears. As such, ,  and  leave a subsequent bomb or bombs, and  leaves a creep.
	+ Dr. Fetus + : The fetuses explode before dropping any bomb.
	+ Dr. Fetus + : Fetuses will both drop a bomb on touching an enemy and burst into multiple small bombs upon hitting the ground.
* : Some Fetuses stick to enemies, expand then explode. However, they do not inflict their contact damage while sticking.
	+ Explosivo + : 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 +  /  /  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 + : 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 + : 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 : Spawns a brimstone ball along with a fetus. Shots are fired automatically as the charge completes.
	+ With : Fetuses hold knives instead of bone clubs and no longer perform the swing attacks.
	+ With  Tears remain unchanged, the forgotten will fire a burst attack alongside the fetus. No effect on the soul.
	+ With : Fetuses perform laser attacks and enhanced bone club attacks separately, causing more damage.
* : Fetuses have a glowing aura around them, but the aura cannot damage the enemy in contact with the fetuses.
* : Fetuses explode into a burst of tears when they hit the ground.
* : The fetuses explode on impact dealing its contact damage, which is often massively increased from the item.
* : Fetuses zap nearby enemies.
* Luck-based tear effects (e.g.  / ): If a fetus has the effect, the fetus cause the effect for each damaging tick.
	+ : Still only two hands can appear at once.
	+ : The rifts spawn only once per fetus.
	+ Luck-based tear effects + : If Isaac's speed is greater than the speed of a fetus he can manually walk the prism through any fetus with a luck-based tear effect (or any fetus) greatly multiplying its effectiveness.
	+ Luck-based tear effects + : 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 +  /  /  /  The Forgotten /  Tainted Forgotten: If a fetus has the effect, each attack also causes the effect.
	+ Luck-based tear effects + : If a fetus has the effect, the laser ring also causes the effect for each damaging tick.
* : 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 + : The knives shrink along with the fetuses, but they retain their tripled damage.
	+ Mom's Knife + : Instead of a barrage of knives, fires a normal Brimstone beam alongside knife-carrying fetuses.
* : 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 + : 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 +  /  /  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.
		- /  The Forgotten: Their swings deal 10.5 damage.
		- Tainted Forgotten: Their swings deal 8.4 damage.
		- : Their swing attacks/spin attacks/projectiles deal 8.75/24/11 damage.
	+ Mucormycosis + : 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 + : 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.
* : Fetuses travel a short distance, then reverse direction and return to Isaac.
* : Fetuses fire short-ranged tears constantly while in contact with an enemy.
* : Parasitoid fetuses spawn spiders/flies and slowing creep with every hit on an enemy.
* : Grants +5 flat damage with no fire rate down.
* : Some Fetuses stick to enemies. However, they only do the Sinus Infection damage ticking and often result in dealing much less damage.
	+ Sinus Infection + : 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 +  /  /  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 + : 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 + : 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.
* : 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 +  /  /  The Forgotten /  Tainted Forgotten: The fetuses hold swords and do not benefit from the others.
	+ Spirit Sword + : 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.
* / : Both fire at the same time.
* : Fetuses are connected with electricity.
* : Fetuses are surrounded by a laser ring that deals half of their damage. The ring's size scales with the fetus' size.
	+ Tech X + : The laser rings do not change into brimstone rings. The Brimstone has no effect unless combined with other additional items.
	+ Tech X + : The rings shrink along with the fetuses, but they retain their tripled damage.
* : Fetuses rapidly shoot a short-ranged laser based on their damage when facing enemies.
	+ Technology + : 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 + : 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! 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 + : Although the laser's damage diminishes along with the fetus, it does not lose its damage over range.
	+ Technology + : Fetuses hold lightsabers and perform laser attacks and enhanced sword attacks separately, causing more damage.

## Interactions

Overridden by C Section:

* (besides stat changes)
* (besides stat changes)

Other interactions:

* : 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. Range "lifetime" is still ticking during the stuck time unlike normal tears, making them markedly harder to use and shorter lasting.
* : No effect; fetuses are considered tears, not familiars.
* : No additional effect for multiple copies of the item.
* : Overrides C Section making Epic Fetus the only item in the game that can override it.
* : Fetuses' appearances change into Eye of Belial tears when passing through an enemy, but they retain their effects.
* : The fetuses can explode and leave fires before they run out of Range, which can result in inflicting less damage.
* : Fetuses only bounce after going rather far or damaging enemies for long enough.
* /: No unique interactions; regular tears are generated which orbit Isaac normally.
* : Fetuses affected by it have the appearance of a fist, but they retain their effects.
* : Burst tears appear to be fetuses, but they do not retain Homing or Piercing effect from C Section.
* : low range burst of 12 non-fetus tears every 15 fetuses fired.
* : Fetuses' appearances change into normal tears when passing through Multidimensional Baby, but they retain their effects.
* : 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.
* / : Fires normal tears.
* : No effect on thrown keys.
* : Fetuses split into normal tears.

## Gallery

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

## 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.
* Isaac's body resembles a Vis. 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 only obtainable via  and , or as a starting item for  Eden /  Tainted Eden.
	+ According to Edmund McMillen, C Section was a "dream item" whose mechanics and many hard-coded synergies were too complex to implement at *Repentance*'s launch, with Kilburn "obsessively" working on the item and other parts of *Repentance*.

## References

1. ↑ https://twitter.com/edmundmcmillen/status/1486230032720691201