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Booster Packs

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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[edit | edit source]

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.[1]

Active Items[edit | edit source]

Name ID Icon Quote Description
Black Hole 512
Black Hole
4 rooms
Nothing can escape Throws a black hole on the ground which sucks in and damages enemies.
Mystery Gift 515
Mystery Gift
One time use
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
Sprinkler
4 rooms
Sprinkles. Upon use, spawns a sprinkler that rotates and fires tears.

Passive Items[edit | edit source]

Name ID Icon Quote Description
Angry Fly 511 Angry Fly 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 Bozo 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 Broken Modem Lag! Enemies, enemy shots, tears, and pickups will briefly freeze in place at random intervals.
Buddy in a Box 518 Buddy in a Box 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 Fast Bombs Rapid bomb drops Grants 7 bombs and allows bombs to be placed rapidly.
Lil Delirium 519 Lil Delirium Delirious friend Grants a familiar that transforms into another random familiar every 10 seconds.

Trinkets[edit | edit source]

Name ID Icon Quote Description
Butter! 122 Butter! 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.
Hairpin 120 Hairpin Danger charge Fully recharges Isaac's active item upon entering a boss fight.
Wooden Cross 121 Wooden Cross My faith protects me Grants a shield that negates the first damage taken once per floor.

Cards[edit | edit source]

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

Other Features[edit | edit source]

Booster Pack #2[edit | edit source]

The second Booster Pack was released on May 12, 2017 on PC, and contains 6 new items, 1 new trinket, and miscellaneous changes.[2]

Active Items[edit | edit source]

Name ID Icon Quote Description
Coupon 521
Coupon
6 rooms
Allow 6 weeks for delivery Upon use, makes a random item from a Shop, Devil deal, or Black Market free.
Moving Box 523
Moving Box
4 rooms
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.
Telekinesis 522
Telekinesis
3 seconds
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.

Passive Items[edit | edit source]

Name ID Icon Quote Description
Jumper Cables 520 Jumper Cables Bloody recharge Grants an active item charge every 15 enemies killed.
Leprosy 525 Leprosy 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 Technology Zero Static tears! Connects Isaac's tears with electricity that can damage enemies.

Trinkets[edit | edit source]

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

Other Features[edit | edit source]

Booster Pack #3[edit | edit source]

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

Active Items[edit | edit source]

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

Passive Items[edit | edit source]

Name ID Icon Quote Description
7 Seals 526 7 Seals Lil harbingers! Grants a random Harbinger familiar that changes every 10 seconds. Harbingers have different behaviors and spawn themed Locusts.
Angelic Prism 528 Angelic Prism 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 Pop! 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[edit | edit source]

Name ID Icon Quote Description
Door Stop 124 Door Stop 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[edit | edit source]

Booster Pack #4[edit | edit source]

The fourth Booster Pack was released on October 10, 2017 and contains 5 new items, 1 new trinket, and 6 new enemies.[3]

Passive Items[edit | edit source]

Name ID Icon Quote Description
Death's List 530 Death's List 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 Haemolacria 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 Lachryphagy 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 Schoolbag Extra active item room Allows Isaac to hold two active items.
Trisagion 533 Trisagion Smite thy enemy Damage down. Tears are replaced with piercing white blasts of light that can damage the same enemy multiple times.

Trinkets[edit | edit source]

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

Monsters[edit | edit source]

Monster Description
Cross Stone Shooter
Cross Stone Shooter
Stationary and invulnerable monster that continuously fires shots in four directions, alternating between cardinal and ordinal.
Fistuloid
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
Gush
Stationary, harmless enemy that continually creates slowing black creep.
Soul Sucker
Soul Sucker
Flies slowly towards Isaac. Spawns a vortex that fires four Brimstone beams in the cardinal directions upon death.
Tar Boy
Tar Boy
Fires a short-ranged spray of shots that leave behind slowing Black Creep. Occasionally burrows underground and reappears under any pools of black creep in the room. If Isaac stands on the Creep, the Tar Boy can fire shots straight upwards out of the Creep underneath Isaac.
Tube Worm
Tube Worm
Pops out of the ground in random locations and fires a long-range spray of arcing shots.

Other Features[edit | edit source]

  • Most items from previous Booster Packs have new and improved graphics.
  • Added 400 new rooms to better integrate the Afterbirth+ enemies (including Booster Pack #4 enemies) into the game.

Booster Pack #5[edit | edit source]

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.[4]

Characters[edit | edit source]

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

Active Items[edit | edit source]

Name ID Icon Quote Description
Book of the Dead 545
Book of the Dead
4 rooms
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
Broken Shovel
4 rooms
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
Mom's Shovel
4 rooms
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 Dark Room.
Sacrificial Altar 536
Sacrificial Altar
One time use
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[edit | edit source]

Name ID Icon Quote Description
Blanket 535 Blanket You feel Safe Grants one Soul Heart. Upon entering a boss room, grants a shield that blocks one hit, then disappears.
Brittle Bones 549 Brittle Bones 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 Broken Shovel It feels cursed One of two parts necessary to create Mom's Shovel.
Dad's Ring 546 Dad's Ring Father's blessing Creates a ring of light around Isaac that petrifies enemies in contact.
Divorce Papers 547 Divorce Papers Tears up + you feel empty Spawns a Mysterious Paper, increases tears, and grants a bone heart.
Flat Stone 540 Flat Stone Skipping tears Tears bounce off the floor, creating splashes. Splashes deal 25% of Isaac's tear damage to all enemies in a small area.
Hallowed Ground 543 Hallowed Ground Portable sanctuary Spawns a white poop familiar, which turns into a white poop when Isaac is hurt.
Jaw Bone 548 Jaw Bone 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 Lil Spewer Puking buddy Spawns a random pill, and grants a small Spewer familiar that charges up and fires different types of creep.
Marbles 538 Marbles 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 Marrow HP up? Grants one bone heart and spawns three red heart pickups.
Mystery Egg 539 Mystery Egg 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 Pointy Rib Stabbing time Spawns a bone familiar that can be aimed with the fire buttons and does contact damage.
Slipped Rib 542 Slipped Rib Projectile shield Spawns a bone familiar that circles around Isaac and reflects enemy shots.

Trinkets[edit | edit source]

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

Monsters[edit | edit source]

Monster Description
Crispy
Crispy
Slowly walks towards Isaac, but increases in speed as they take damage. Constantly passively takes damage.
Cross Stoney
Cross Stoney
Chases Isaac and shoots 4 tears vertically and diagonally like a Cross Grimace. Dies when the room is cleared.
Only appears in Aprils Fool (challenge #32) as replacements to regular Stoneys.
Dank Charger
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
Leper
Walks around the room, chasing Isaac but running way if they take damage. Releases a Leper Flesh for every 15 damage taken. After being reduced to 15 health, chases Isaac continously and leaves damaging Red Creep. Spawns a Leper Flesh and a Grey-coloured Gusher upon death.
Leper Flesh
Leper Flesh
Moves erratically and chases Isaac. Fires a blood shot at Isaac upon death.
Mr. Mine
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
Mr. Red Maw
Walks towards Isaac and attacks by launching its head towards him. Turns into a Red Maw or Gusher upon death depending on the killed body segment. Occasionally separates at will.

Bosses[edit | edit source]

Boss The Matriarch.png
The Matriarch

Other features[edit | edit source]

  • 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 supposedly have a chance to become Broken Gaping Maws, although this never actually happens ingame.[5]
  • 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[edit | edit source]

Trivia[edit | edit source]

  • Booster Pack 3 is the only booster pack to not be featured on a 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.

References[edit | edit source]


The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth
Achievements Achievements Attributes Attributes Bosses Bosses TarotCard.png Cards and Runes Challenges Challenges Chapters Chapters
Characters Characters MainPageBabies.png Co-op Items Items Item pools Item pools Monsters Monsters Objects Objects
Pickups Pickups Pills Pills Rooms Rooms Seeds Seeds Transformations Transformations Trinkets Trinkets