Booster Packs

Booster Packs are recurring content updates for The Binding of Isaac: Afterbirth †. Booster Packs contain high-quality, popular, and balanced community-developed mods as updates in the game to continue to add features.

Booster Pack #1

The first Booster Pack was released on March 23, 2017 on PC, and contains 9 new items, 3 new trinkets, and 3 new special cards, along with some new features.

Active Items

Name	ID	Icon	Quote	Description
Black Hole	512		Nothing can escape	Throws a black hole on the ground which sucks in and damages enemies.
Mystery Gift	515		Wrapped up nice for you!	Upon use, spawns a random item from the current room's item pool, with a chance to spawn A Lump of Coal or The Poop instead.
Sprinkler	516		Sprinkles.	Upon use, spawns a sprinkler that rotates and fires tears.

Passive Items

Name	ID	Icon	Quote	Description
Angry Fly	511		He's violent	Spawns a fly familiar that orbits around a random enemy and deals 5 damage per tick to enemies it comes in contact with.
Bozo	513		Party time!	Increases damage by a flat 0.1 and grants a soul heart. Enemies can randomly become briefly charmed or feared. Taking damage has a chance to spawn a rainbow poop.
Broken Modem	514		Lag!	Enemies, enemy shots, tears, and pickups will briefly freeze in place at random intervals.
Buddy in a Box	518		What could it be?!	Grants a familiar with a random tear effect. The familiar is randomized at the start of each floor.
Fast Bombs	517		Rapid bomb drops	Grants 7 bombs and allows bombs to be placed rapidly.
Lil Delirium	519		Delirious friend	Grants a familiar that transforms into another random familiar every 10 seconds.

Trinkets

Name	ID	Icon	Quote	Description
Hairpin	120		Danger charge	Fully recharges Isaac's active item upon entering a boss fight.
Wooden Cross	121		My faith protects me	Grants a Holy Mantle shield upon entering a new floor, which protects against one hit of damage.
Butter!	122		Can't hold it!	Using an active item will drop it onto a pedestal on the ground. Taking damage may result in dropping a passive item.

Cards

Name	ID	Icon	Message	Effect
Huge Growth	52		Become immense!	Makes Isaac large for the current room, increasing his range and damage.
Ancient Recall	53		Draw 3 cards	Spawns 3 random cards.
Era Walk	54		Savor the moment	For the current room, enemies are slowed, Isaac's speed is increased, and his shot speed is decreased.

Other Features

• Dice Rooms now have a small icon in the corner of the room that denotes what the effect of the room is, inspired by this Steam Workshop mod.
• Added a new option in the menu to display charge bars, based on this Steam Workshop mod.
• Added 5 new Eden hairstyles, based on this Steam Workshop mod.

Booster Pack #2

The second Booster Pack was released on May 12, 2017 on PC, and contains 6 new items, 1 new trinket, and miscellaneous changes.

Active Items

Name	ID	Icon	Quote	Description
Coupon	521		Allow 6 weeks for delivery	Upon use, makes a random item from a shop, devil deal, or black market free.
Telekinesis	522		Power of the mind	Upon use, for the next two seconds, any enemy shots that come near Isaac are held in place. After the charge is depleted, they are fired back as tears.
Moving Box	523		Pack and unpack	If the box is empty, picks up all items and pickups in a room and stores them. If the box is not empty, places all stored items and pickups in the current room.

Passive Items

Name	ID	Icon	Quote	Description
Jumper Cables	520		Bloody recharge	Grants an active item charge every 15 enemies killed.
Leprosy	525		You're tearing me apart!	Upon taking damage, grants a body part as an orbital, which blocks enemy shots and deals 7 damage per tick to enemies it comes in contact with. The orbitals will be destroyed if they take enough damage from enemies or enemy shots.
Technology Zero	524		Static tears!	Connects Isaac's tears with electricity that can damage enemies.

Trinkets

Name	ID	Icon	Quote	Description
Filigree Feather	123		Angelic Spoils!	Angels drop items instead of key pieces when defeated.

Other Features

• Angel Rooms were rebalanced - they contain more items but only a single one can be collected.
• Mods no longer disable achievements after beating Mom once. This includes use of the Debug Console.
• Active items now charge during Challenge Room waves.
• Multiple items that affect the appearance of bombs now stack visually, based on this Steam Workshop mod.
• Jar of FliesEvery time Isaac kills an enemy, a fly will be added to the jar, up to a maximum of 20. Using the Jar of Flies will release all the flies that are currently in the jar as friendly blue flies that will damage enemies. now changes appearance depending on how many flies are in the jar, based on this Steam Workshop mod.
• Added Mom's Dressing Table, which changes Isaac's appearance to only reflect a few of his items, based on this Steam Workshop mod.
• Added the Stompy transformation.

Booster Pack #3

The third Booster Pack was released on June 30, 2017 on PC, and contains 4 new items, and 1 trinket.

Active Items

Name	ID	Icon	Quote	Description
Mr. ME!	527		Caaan do!	Summons a controllable ghost that can perform various tasks depending on what it targets.

Passive Items

Name	ID	Icon	Quote	Description
7 Seals	526		Lil harbingers!	Grants a random Harbinger familiar that changes every 10 seconds.
Angelic Prism	528		Eclipsed by the moon	Grants a prism orbital with a large orbital radius. Tears that pass through the prism split into four multi-colored tears.
Pop!	529		Eyeball tears!	Replaces Isaac's tears with eyeballs that can bounce off of each other. The eyeballs are not limited by range, and will instead dissipate when they stop moving or when hitting an enemy or obstacle.

Trinkets

Name	ID	Icon	Quote	Description
Door Stop	124		Hold the door!	The last door Isaac went through stays open, allowing him to leave the room even if enemies are in it.

Other Features

• Added new Eden hairstyles, based on this Steam Workshop mod.

Booster Pack #4

The fourth Booster Pack was released on October 10, 2017 and contains 5 new items, 1 new trinket, and 6 new enemies.

Passive Items

Name	ID	Icon	Quote	Description
Death's List	530		Just hope you're not next...	Grants a reward if all enemies in a room are killed in the order they are marked.
Haemolacria	531		I'm seeing red...	Tears are now fired in an arc. Upon hitting the floor, an obstacle, or an enemy, they burst into many smaller tears in all directions. Increases tear delay.
Lachryphagy	532		Feed them!	Isaac's tears decelerate as they travel. Upon stopping or hitting an obstacle, they burst into 8 tears in all directions. Tears can be fired into other tears to feed them, increasing their damage.
Schoolbag	534		Extra active item room	Allows Isaac to hold two active items.
Trisagion	533		Smite thy enemy	Tears are replaced with piercing white blasts of light.

Trinkets

Name	ID	Icon	Quote	Description
Extension Cord	125		Charged friends	Beams of yellow electricity flow between Isaac and his familiars, damaging any enemies between them.

Monsters

Monster	Description
Cross Stone Shooter	Stationary and invulnerable monster that continuously fires shots in four directions.
Fistuloid	Flies towards Isaac in an erratic waving motion, periodically firing a blood shot towards Isaac that also knocks itself back. Upon death, fires a worm that flies off screen.
Gush	Stationary, harmless enemy that continually creates slowing black creep.
Soul Sucker	Flies slowly towards Isaac. Spawns a vortex that fires four Brimstone beams in the cardinal directions upon death.
Tar Boy	Pops out of the ground in random locations and fires a short-ranged spray of shots that leave behind slowing black creep. If Isaac stands in the creep, the Tar Boy can fire shots straight upwards out of the creep underneath Isaac.
Tube Worm	Pops out of the ground in random locations and fires a long-range spray of arcing shots.

Other Features

• Most items from previous Booster Packs have new and improved graphics.
  • Broken ModemEnemies, enemy shots, tears, and pickups will briefly freeze in place at random intervals. collectible sprite was changed.
  • Technology ZeroConnects Isaac's tears with electricity that can damage enemies. collectible and costume sprites were changed.
  • Angry FlySpawns a fly familiar that orbits around a random enemy and deals 5 damage per tick to enemies it comes in contact with. collectible and familiar sprites were changed.
  • SprinklerUpon use, spawns a sprinkler that rotates and fires tears. collectible and entity sprites were changed.
  • 7 SealsGrants a random Harbinger familiar that changes every 10 seconds. collectible and familiar sprites were changed. Familiar sprites were based on this Steam Workshop mod by Quartz.
  • Pop!Replaces Isaac's tears with eyeballs that can bounce off of each other. The eyeballs are not limited by range, and will instead dissipate when they stop moving or when hitting an enemy or obstacle. collectible sprite was changed.
  • HairpinFully recharges Isaac's active item upon entering a boss fight. trinket sprite was changed.
  • Butter!Using an active item will drop it onto a pedestal on the ground. Taking damage may result in dropping a passive item. trinket sprite was changed.
  • Door StopThe last door Isaac went through stays open, allowing him to leave the room even if enemies are in it. trinket sprite was changed.
• Added 400 new rooms to better integrate the Afterbirth+ enemies (including Booster Pack #4 enemies) into the game.

Booster Pack #5

The fifth and last Booster Pack was released on April 30, 2018 and contains 1 new character, 18 new items, 3 new trinkets, 7 new enemies, and a new boss.

Characters

The Forgotten is a new character added in the Booster pack.

Active Items

Name	ID	Icon	Quote	Description
Book of the Dead	545		Rise from the grave	Upon use, spawns a friendly Bony or an orbital bone for each enemy killed in the current room.
Broken Shovel	550		It feels cursed	While held, causes multiple Mom's Foots to come down and stomp on Isaac. One of two parts necessary to create Mom's Shovel.
Mom's Shovel	552		Lost but not forgotten	Spawns a trapdoor that leads to the next floor upon activation. Unlocks The Forgotten when used on a mound of dirt that appears in Dark Room.
Sacrificial Altar	536		He demands a sacrifice	Upon use, sacrifices up to 2 familiars and spawns an item from the Devil Room Pool for each familiar sacrificed.

Passive Items

Name	ID	Icon	Quote	Description
Blanket	535		You feel Safe	Grants one soul heart. Upon entering a boss room, grants a shield that blocks one hit, then disappears.
Brittle Bones	549		Everything hurts	Replaces all red hearts with 6 empty bone hearts. Upon losing a bone heart, Isaac fires bones in 8 directions and permanently gains a tears up.
Broken Shovel	551		It feels cursed	One of two parts necessary to create Mom's Shovel.
Dad's Ring	546		Father's blessing	Creates a ring of light around Isaac that petrifies enemies in contact.
Divorce Papers	547		Tears up + you feel empty	Spawns a Mysterious Paper, increases tears, and grants a bone heart.
Flat Stone	540		Skipping tears	Tears bounce off the floor. Tears that hit an enemy after bouncing deal splash damage to all nearby enemies for 25% of Isaac's tear damage.
Hallowed Ground	543		Portable sanctuary	Spawns a white poop familiar, which turns into a white poop when Isaac is hurt.
Jaw Bone	548		Fetch!	Spawns a familiar that flies the room while firing, dealing a flat 7 damage to enemies that come in contact and retrieving pickups.
Lil Spewer	537		Puking buddy	Spawns a random pill, and grants a small Spewer familiar that charges up and fires different types of creep.
Marbles	538		Choking hazard	Spawns 3 random trinkets. Taking damage has a small chance to swallow Isaac's currently held trinket, gaining its effect permanently.
Marrow	541		HP up?	Grants one bone heart and spawns three red heart pickups.
Mystery Egg	539		Sacrificial insemination	Spawns an egg familiar, which cracks and turns into a random friendly enemy when Isaac is hurt. The egg regenerates upon entering a different room.
Pointy Rib	544		Stabbing time	Spawns a bone familiar that can be aimed with the fire buttons and does contact damage.
Slipped Rib	542		Projectile shield	Spawns a bone familiar that circles around Isaac and reflects enemy shots.

Trinkets

Name	ID	Icon	Quote	Description
Rotten Penny	126		Wealth of flies	Spawns a blue fly every time a coin is picked up.
Baby-Bender	127		Feed them magic!	Grants Isaac's familiars homing shots.
Finger Bone	128		It looks brittle	Grants a chance to gain a bone heart upon taking damage.

Monsters

Monster	Description
Crispy	Slowly walks towards Isaac, but increases in speed as they take damage. Constantly passively takes damage.
Cross Stoney	Chases Isaac and shoots 4 tears vertically and diagonally like a Cross Grimace. Dies when the room is cleared. Only appears in challenge #32 (Aprils Fool) as replacements to regular Stoneys.
Dank Charger	Slowly moves around the room, charging at Isaac very rapidly when he gets in its line of sight, leaving a trail of slowing black creep.
Leper	Walks around the room, avoiding Isaac. Releases a Leper Flesh for every 15 damage taken. After being reduced to 15 health, starts chasing Isaac and leaves damaging red creep. Spawns a Leper Flesh and Gusher upon death.
Leper Flesh	Moves erratically and chases Isaac. Fires a blood shot at Isaac upon death.
Mr. Mine	Can only appear in pits. Attempts to launch itself at Isaac if he comes near. Occasionally burrows and pops up in another pit, and fires six shots in all directions upon death.
Mr. Red Maw	Walks towards Isaac and attacks by launching its head towards Isaac. Turns into a Red Maw or Gusher upon death depending on the killed body segment. Occasionally separates at will.

Bosses

The Matriarch

Other features

• Bone hearts, a new heart type.
• Golden bombs now have a pickup sound effect.
• Black hearts now have a pickup sound effect.
• White Poop, a new poop type.
• Gaping Maws have a chance to become Broken Gaping Maws.
• Changes to Greed Mode Angel rooms.
• Added 817 new rooms.
• New charge bar graphics.
• New and improved graphics based on this Steam Workshop mod.
• New and improved graphics for burrowing monsters based on this Steam Workshop mod.
• Added the unlocks from the Switch version of the game.
• Added 64 new achievements, including 36 from the Switch version.
• Added 43 new Co-op Babies, 41 being cosmetic and two unlockables(Bone Baby and Bound Baby).

Gallery

• 

  Concept Art For Cells, Fused Cells, and Tissues, scrapped Booster Pack enemies by LeatherIceCream.

Trivia

• Booster Pack 3 is the only booster pack to not get its own blog post.
• The developers of Antibirth helped create booster packs 4 and 5.
• Many of the added Co-op Babies from Booster Pack 5 are references to popular mods that were never added in the Booster Packs.