The Binding of Isaac: Afterbirth †

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Afterbirth † is an expansion to The Binding of Isaac: Rebirth that was released on January 3rd, 2017 and costs $9.99.

For a list of the pre-release blog posts, see The Binding of Isaac: Afterbirth † (Pre-Release).

Nicalis, the game's publisher, also created mod tools for easier creation of community mods with the release. They will occasionally release monthly or bi-monthly updates to Afterbirth † that incorporate certain high-quality and popular mods. These updates are known as Booster Packs.

Features

• 68 new items, 29 new trinkets, and 19 new pickups
• 4 new bosses, a new final boss, and new alternate forms of existing bosses
• 3 new transformations
• A new character, Apollyon
• Hundreds of new rooms
• New monsters and champion variants
• 5 new challenges
• 63 new achievements
• New final chapter
• Hard Mode for Greed Mode
• Daily Greed Mode runs (not yet implemented)
• A Bestiary that shows detailed information about monsters
• A "Victory Lap" mechanic; players who have beaten Dark Room can start over with all their items intact and increased game difficulty
• Various features for modding support, including:
  • An item pool editor
  • A room editor
  • An animation editor
  • Lua support
  • Custom challenge creator
  • Monthly booster pack updates, permanently implementing high-quality mods into the game.

Additions

For content added in booster packs, see Booster Packs.

Mechanics

HUD

Found HUD

• Found HUD is a HUD addition that gives numerical values to the player's current stats (e.g., damage, luck, speed, devil room chance). It can be enabled through the options menu.
• It is based off of the Missing HUD mod for Rebirth and Afterbirth.

Victory Lap

• A Victory Lap allows you to start a new run with almost all of your final items after completing the Dark Room. Multiple laps can be made as long as the Dark Room is cleared each time.
  • Completion Marks and most Achievements cannot be earned.
  • Isaac will take a full heart of damage on all floors after beginning a victory lap (unless he has The Wafer).
  • Some Items are lost upon starting a victory lap. Items lost this way are added back into their respective item pools and can be acquired again.
  • If the initial run was on normal difficulty, all victory laps will be on hard difficulty.
  • On the third and subsequent victory laps, the character will turn into The Lost. This version of The Lost does not get a Holy Mantle or D4. However, if the run was started as The Lost (or if the Holy Mantle was found) it is possible to keep the Holy Mantle from the previous run.
  • On the third and subsequent victory laps, Shops will no longer appear.
  • On the third and subsequent victory laps, Red Chests in the Dark Room will turn into Brown Chests and Golden Chests.
  • Killing any final boss aside from The Lamb will end the game, and the run will not be continued further.

Menus

Options

Charge bars

• Added a new "charge bars" option in the menu, for passive items that need to be charged up before usage.
• This include:
  • Brimstone (Collectible and Azazel)
  • Monstro's Lung
  • Chocolate Milk
  • Maw Of The Void
  • Cursed Eye
  • Lil Brimstone
  • Incubus
  • Cambion Conception
  • Immaculate Conception
  • Lil Monstro

RERUN

• RERUN is unlocked after completing the RERUN achievement.
• After winning a run the Continue option in the main menu will be replaced by Rerun. Selecting it starts a new run using most of the previous won run's items. Isaac will take full heart damage on all floors.

Player

Characters

Character	Apollyon
Health	Template:RedHeartTemplate:RedHeart
Damage	3.5 (*1.00)
Tears	+0
Shot Speed	1
Range	23.75
Speed	1.0
Luck	0
Starting Pickups	None
Starting Item(s)	Void

Transformations

Transformation	Appearance	Transformation effect	Item	Icon	Item effect	Recharge
Bookworm	File:Bookworm Transformation.png	Roughly 50% of the time, Isaac shoots an extra tear, like 20/20. Template:Item Template:Item Template:Item Template:Item Template:Item Template:Item Template:Item Template:Item Template:Item Template:Item Template:Item Template:Item
			Spider Baby	File:Spider Baby Transformation.png	Spawns a spider familiar that applies random status effects to enemies it comes in contact with. Template:Item Template:Item Template:Item Template:Item Template:Item Template:Item
						Adult	File:Adult Transformation.png	Grants a heart container. Lowers the pitch of Isaac's voice.
									3 Puberty pills
						Stompy	None	Taking damage has a chance to spawn rock waves. Template:Item Template:Item
									One Makes You Larger pills

Items

68 new items were added in the expansion: 19 activated items and 49 passive items.

Trinkets

29 new trinkets were added in the expansion.

Pickups

Pickups & Chests

Name	Icon	Effects
Scared Hearts		Identical to the standard Red Heart, but will run away as the player moves towards it.
Half Soul Hearts		Half soul hearts are a variant of normal soul hearts that only add half a heart to the end of the normal bar. They are unlocked after getting the "Mr. Resetter!" achievement, which is granted after the player resets seven runs in quick succession.
Blended Hearts	File:Red soul heart.png	A heart variant which will fill up a full red Heart Container, but will act as a Soul Heart when no Containers are free.
Charged Keys		Charged Keys grant a key and fully charge your currently held active item upon pickup. Can be differentiated from regular keys by having a pulsating white glow while on the ground. Unlocked after beating Challenge #33: Pokey Mans.
Mimics		Mimics appear similar to Brown Chests until Isaac moves near, at which point they sprout spikes that damage the player as a Spike Chest would. They can be distinguished from Brown Chests by their darker, purplish-brown coloring, a spot of blood on the lower-right corner, and the grayish spot on each side of the latch where the spikes will sprout from.

Pills

Pill	Effect
Feels like I'm walking on sunshine!	Temporarily makes Isaac invincible, similar to Unicorn Stump. Unlocked by acquiring the Sin Collector achievement.
Gulp!	Upon use, any trinkets that the player is holding are destroyed, and their effects are permanently applied to the player. Unlocked by acquiring the Once More With Feeling! achievement.
Horf!	Upon use, Isaac shoots an explosive tear with the Ipecac effect. Unlocked by acquiring the Dedication achievement.
I'm Drowsy...	Upon use, slows all enemies for the duration of the room.
I'm Excited!!!	Upon use, increases the speed of all enemies for the duration of the room. The effect triggers again 30 seconds after use and 60 seconds after use.
Something's wrong...	Creates a pool of black creep beneath Isaac.
Vurp!	Throws up the last pill you used. Unlocked by acquiring the U Broke It! achievement. Will spawn itself if no other pills were taken beforehand.
X-Lax	Creates a pool of slippery brown creep underneath Isaac.

NPCs

Monsters

Template:MonsterTemplate:MonsterTemplate:MonsterTemplate:MonsterTemplate:MonsterTemplate:MonsterTemplate:MonsterTemplate:Monster

Monster	Description

Bosses

Four new bosses were added to Afterbirth †. Additionally, Ultra Greed received a second form in Greed Mode's hard mode.

Rag Mega	Big Horn	Sisters Vis	Delirium	Ultra Greedier

Environment

Chapters

File:The Void.png

The Void

Obstacles

Super special rocks

• Super special rocks are tinted rock variants which are much harder to spot, as they have a smaller mark and are not discolored. Super special rocks takes two bombs to blow up, and drop the contents of two tinted rocks.

Machines

Mom's Dressing Table

• It appears in the starting room of a floor if Isaac has 8 or more items.
• If Isaac bumps into Mom's Dressing Table, his appearance will be randomly changed so that only a few of his items are displayed.
• Hitting Mom's Dressing Table with an explosive will cause it to vanish and drop 1-4 pills. There is a 1% chance to spawn one of the following items instead: Mom's Underwear, Mom's Heels, Mom's Lipstick, Mom's Bra, Mom's Pad, Mom's Eyeshadow, Mom's Contacts, Mom's Wig, Mom's Perfume or Mom's Pearls.

Challenges

Name	Conditions	Goal	Unlocked by	Unlocks Template:Chlg Template:Chlg Template:Chlg Template:Chlg Template:Chlg

Achievements

Name	Image	Description	Unlock	In Game Secret Number Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv Template:Achv

Changes

Player

Characters

Magdalene

• If the Aprils Fool challenge is completed, she will also start with a Speed Up pill.

Samson

• If the Ultra Hard challenge is completed, he will also start with Child's Heart.

Lazarus

• If the Backasswards challenge is completed, he will start with Anemic.

Lazarus Risen

• If the Backasswards challenge is completed, the Anemic effect is permanent and no longer requires him to take damage.

Eden

• Holding R to reset will consume an Eden Token and start a new run.
• Added 30 new Eden hairstyles.

Items

Activated Collectibles

Butter Bean

• If Isaac swaps Butter Bean for a different active item, then picks up Butter Bean again, it has a small chance to transform into Wait What?.

Diplopia

• No longer spawns extra items for empty item pedestals.

• After 5 uses, it will turn into The Hourglass.

Jar of Flies

• The item's sprite fills up with more flies depending on how many flies it contains.

Undefined

• The Void is reset on exiting the I AM ERROR room, and can be cleared repeatedly as long as the player is able to gather enough charges to successfully warp to it.

Passive Collectibles

The Battery

• Self-recharging active items can charge the yellow meter, allowing Isaac to use them twice immediately.

Blue Map

• Will display the additional Secret Room granted by Fragmented Card.

Cambion Conception

• The effect of Dull Razor counts towards the Cambion Conception payout allowing familiars to be spawned without taking real damage.

Dead Cat

• This item counts as 9 items, so if the player is game on trying for an early portal to The Void after beating Mom, this will significantly boost the progress closer to 20 items.

Epiphora

• Being hit, changing rooms, and using items no longer reset the Epiphora bonus.
  • During the delay when transitioning between rooms, picking up an item, or using an active item, it's possible to change firing direction without resetting the bonus.

Fruit Cake

• New possible effects:
  • Compound Fracture
  • Euthanasia
  • Eye of Greed
  • Jacob's Ladder
  • Little Horn
  • Ouroboros Worm
  • Parasitoid
  • Sinus Infection
  • Sulfuric Acid

Hive Mind

• The effect also applies to locusts.

Lil Brimstone

• Got renamed from "Lil' Brimstone" to "Lil Brimstone".

Lil Haunt

• Got renamed from "Lil' Haunt" to "Lil Haunt".

PHD

• Converts:
  • ??? into Telepills
  • Addicted into Percs!
  • Paralysis into Pheromones
  • Retro Vision into I can see forever!
  • R U A Wizard? into Power Pill!
  • X-Lax into Something's wrong...

Purity

• Better visualisation of Purity's glow.

Rubber Cement

• Tears bounce off bombs.

The Small Rock

• The speed and tears changes will take effect immediately. Without Afterbirth+, they didn't immediately change until Isaac's speed or tears stats are updated the next time.

Steam Sale

• Items have a chance to be discounted further by random sales; for example, a discounted item originally costing 5 coins will then cost 2 coins instead of 3.

Trinkets

• Wrath and Super Wrath's bombs now turn into their respective pickups.

• Can be removed by Smelter and Gulp!.

Interactions

9 Volt + Brown Nugget - Brown Nugget starts at half charge after use. 9 Volt + The Candle - The Candle starts at half charge after use. Analog Stick + Incubus - Incubus cannot fire in non-cardinal directions, only tears up applies. Black Rune + Blank Card - Allows Isaac to consume unwanted pickups and items frequently, gaining a lot of free stat upgrades and blue spiders/flies. Bloody Lust + Dull Razor - Safely provides the damage boost without needing to actually take damage. Bob's Rotten Head + Void - If Bob's Rotten Head is absorbed, it can be thrown after using Void, but will be invisible. Breakfast + Potato Peeler - Increases the usefulness of the item once item pools are depleted (i.e. in a breaking run), as the heart containers can be converted into Cubes of Meat, as well as increase the player's damage and range. Breath of Life + Void - Using Void with Breath of Life will repeatedly damage Isaac until he leaves the room. Brimstone + Ipecac - Isaac shoots Ipecac tears while charging Brimstone. Isaac gains increased damage, decreased tears, and the poison effect. Camo Undies + Marked - Isaac will stay camouflaged until the crosshair is moved. Compound Fracture + The Ludovico Technique - Shoots out smaller tears when attacking an enemy. Compound Fracture + The Parasite - Both tear split effects happen simultaneously. Cursed! + Incubus - Incubus fires 4 tears. Cursed Eye + Incubus - A burst of tears is fired, but it does not need to be charged. Duct Tape + Guillotine - Causes tears to be fired from far below and to the right of Isaac. This causes tears to be out of bounds unless Isaac is standing in the top-left corner of the room. Dull Razor + Habit - Using the Dull Razor activates the Habit, restoring one charge to the Dull Razor. With items that reduce the Dull Razor to one charge or the Car Battery, it can be used infinitely. Dull Razor + Stop Watch - Can activate without taking any damage, effectively increasing its usage. Epic Fetus + Monstro's Lung - As of current version this synergy is bugged and only a single missile fires. Finger! + Mom's Contacts - Has a high chance to freeze any enemies the finger is pointing towards. Ghost Pepper + Ipecac - If a fire is generated at the same time as a Ipecac shot, the Ipecac shot will explode instantly. Ghost Pepper + The Ludovico Technique - Fires created from Ghost Pepper will destroy the tear and cause it to respawn on Isaac. Ghost Pepper + Mom's Knife - The flames can shoot from Isaac while holding the fire button. Ghost Pepper + The Poop - Fire will appear behind Isaac when The Poop is used. Glowing Hour Glass + Void - Allows Glowing Hour Glass to be used indefinitely without turning into The Hourglass. Gulp! + Placebo - Can be used as a 4-charge Smelter. I'm Drowsy... + Placebo - Can be used repeatedly for instant Stop Watch effect without having to incur damage. This is very useful when fighting Hush and Delirium (especially as The Lost). Ipecac + Lead Pencil - A barrage of Ipecac tears are fired that land right next to Isaac, hitting him. Ipecac + The Ludovico Technique - +4 damage bonus, no explosion. Ipecac + Mom's Knife - Also adds +4 damage. Jacob's Ladder + The Parasite - Each split creates an electrical burst. Lead Pencil + Technology 2 - Technology 2 prevents Lead Pencil and normal tears from firing. Lead Pencil + Tech X - Does not work with Tech X. Little Horn + Tech X - Overridden by Tech X. The Ludovico Technique + Multidimensional Baby - An additional Ludovico tear is spawned when it passes through Multidimensional Baby, at the start of every room, and persists like the Ludovico tear itself. The Ludovico Technique + Pause - The tear deals damage, even if the enemies are stopped. Moving the tear unpauses the enemies. More Options + Void - Using Void will cause both Items to be absorbed. Poke Go + Sworn Protector - Catching an enemy that shoots bullets allows you to sit and farm Eternal Hearts, since the enemy will fire at you if no other enemies are in the room Rubber Cement + Sinus Infection - Boogers stick to enemies, but otherwise they bounce normally. Smelter + Store Credit - Store Credit will still only activate once after being absorbed. Tammy's Head + Vibrant Bulb - Isaac's bonus states will upgrade (like Damage,Luck,Tears...),and when used,the tears of the item are more better. There's Options + Void - Using Void will cause both Items to be absorbed.

Pickups

Pills

• The Friends till the End! pill now has narration.

Cards and Runes

• It will do absolutely nothing towards Delirium, as it is the only enemy immune to chaos card.
• It will only kill one phase of Ultra Greed in Greedier Mode.

• Its card ID is 48 instead of 43.

Chests =

Golden chest

• The Golden Chest pool also includes bags, such as IV Bag or Sack of Pennies.

Spike chest

• Spike chest will deal damage normally even in The Chest/Dark Room.

NPCs

Monsters

Dank Squirt

• Dank Squirts can be spawned if Delirium turns into Brownie at low health and dies. Killing them will count as killing Delirium.

Drowned Hive / Hive

• When he is a pulsing red champion, every enemy he spawn will be invincible until Isaac kills it.

Super Pooter

• Got renamed from "Fat Fly" to "Super Pooter".

Nest

• Can spawn Ministros on death.
• When he is a pulsing red champion, every enemy he spawn will be invincible until Isaac kills it.

Oob

• Can spawn Poison Minds instead of regular Brains.

Mini-Bosses

Greed

• Has a small chance to spawn Ministros instead of Hoppers.

Super Greed

• Can drop Head of the Keeper.

Bosses

Brownie

• Has new a champion version:
  • Black: Spawns up to 3 Maggots at once instead of Corn Dips. Upon death, spawns 2 Dank Squirts.

The Duke of Flies

• The Large Attack Flies will now orbit around him when coughed up instead of homing in on Isaac.

Hush

• Due to the way entity stacking works ??? may rarely appear instead and once defeated will skip "phase 2" entirely and will give a completion mark as if Hush was defeated.

Krampus

• Can shoot Brimstone lasers in all 4 diagonal directions.

Little Horn

• Has new champion versions:
  • Orange: Spits out an orange Troll Bomb instead of a black ball. The bomb deals contact damage and leaves a patch of fire similar to Hot Bombs.
  • Black: Does not attack with Pits or troll bombs, but fires smoke balls more frequently.

Mega Satan

• If The Void is unlocked, there is a 50% chance that the game will not immediately end, and Mega Satan will instead drop an ending chest along with a portal. Entering the chest ends the game and plays the cutscene, while entering the portal will take Isaac to The Void.

Rag Man

• Has new champion versions:
  • Black: Spawns 2 spiders instead of a Ragling. Uses his resurrect frequently. This won't resurrect anything since the spiders don't leave corpses, but still heals him. Sprays tears during his resurrect, similar to Monstro's spit.
  • Red: No longer fires tears. Can have up to 4 Raglings at one time. Can revive 2 Raglings at once.

Triachnid

• Now has a death animation.

Ultra Greed

• Has a chance to spawn Blisters instead of Keepers.

Environnement

Chapters

???

• Additionally, an exit will spawn in the corner of the room, containing a Portal leading to The Void.

Cathedral

• Some rooms contain Angel Statues that can be bombed to summon the Angels and acquire key pieces.

Rooms

Treasure Room

• There is a chance that 2-3 Greed Gapers may appear in the room.
• Treasure rooms can rarely contain two items that can both be taken or poop, trinket and a couple of pickups instead of an item.
• New layouts:

Shop

• There is a 20% chance for donation machine to be replaced by restock box.
• There is a small chance for the shop to be replaced by one of its two rare variants:

(the two pennies are lucky pennies)

Curse Room

• Can contain a Devil statue and a random item, surrounded by spikes.

Sacrifice Room

• New layout:

Secret Room

• New theme:
  • Angel Room: 3 soul hearts, 2 blue fireplaces, Angel statue in center which does not drop key piece for respective angel.

Devil Room

• Can contain:
  • 4 Deals with the Devil
  • 5 red chests
  • 3 devil beggars.
• Urns may spawn in the Devil Room.
• An angel statue can rarely substitute the Satan statue, and can be awoken with an explosion.
  • Angels spawned in this way do not drop Key Pieces.

Angel Room

• Can contain 5 soul hearts.
• Two angel statues can appear in the same room, allowing Isaac to fight both Uriel and Gabriel. It is possible to get both Key Pieces if Isaac awakes and fights each of them one by one; however, fighting both at once will only spawn one Key Piece corresponding to the last defeated angel.

Dice Room

• The 4 pips room rerolls item pedestals located in the Shop and the Library.
• Have a small icon in the corner of the room that denotes what the effect of the room is.

I AM ERROR

• Can contain two blood donation machines, two beggars, and two beds.

Boss Rush

• There is a small chance that there will be 8 items to choose from.
• Using the Black Rune will start the Boss Rush.
• New layout:

Crawl Space

• New layouts (rares):

Black Market

• Players can no longer access the Black Market through the wall glitch. However, it is still possible to access the Black Market using the glitch via special circumstances including having Ipecac and The Inner Eye.

Obstacles

Mushrooms

• Have a chance to spawn Mushrooms.

Skulls

• Have a chance to spawn Mushrooms.

Machines

Greed machine

• Has a much lower jam rate in Greedier Mode.

Challenges

• Killing Delirium will count as completing challenges.

I RULE!

• Gives only The Negative after defeating Mom, forcing you to progress through Sheol and the Dark Room instead of the Cathedral and The Chest.

Bugs

New bugs

Bug!	If an angel statue is broken inside the devil room the door will incorrectly be shown to be open, but can't be escaped from

Bug!	Sometimes, Scolex's sprite will be replaced with that of a second form Frail, who has an upside-down tail. This is purely a visual bug and the Frail will have all of Scolex's attacks and AI, though the tail's hitbox will be slightly misplaced. This appears to only happen to black champion Scolex, and has been seen in both Hard and Greedier Mode.

Bug!	When Scolex is slowed, some of his body parts may detach or won't even show up - they will only be visible while entering the ground (especially the tail).

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