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(in Afterbirth † and Repentance)
This article is about the Afterbirth † content updates. For the passive item, see Booster Pack (Item).

Booster Packs were recurring content updates for The Binding of Isaac: Afterbirth †. Booster Packs contained popular community-developed mods as updates in the game continued 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.[1]

Active Items[ | ]

Name ID Icon Quote Description (in Repentance) Quality
Black Hole 5.100.512
Black Hole
4 rooms
Nothing can escape Throws a black hole on the ground which sucks in and damages enemies. 1
Mystery Gift 5.100.515
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 Collectible A Lump of Coal iconA Lump of Coal or Collectible The Poop iconThe Poop instead. 3
Sprinkler 5.100.516
Sprinkler
4 rooms
Sprinkles. Upon use, creates a stationary sprinkler that rotates and fires tears in 8 directions. The tears copy Isaac's stats and most tear effects. 2

Passive Items[ | ]

Name ID Icon Quote Description (in Repentance) Quality
Angry Fly 5.100.511 Angry Fly He's violent Spawns a fly familiar that orbits around a random enemy and deals 30 damage per second to enemies it comes in contact with. 1
Bozo 5.100.513 Bozo Party time! +0.1 flat damage, grants a Soul HeartSoul Heart. Enemies can randomly become briefly charmed or feared. Taking damage has a chance to spawn a Rainbow PoopRainbow Poop. 2
Broken Modem 5.100.514 Broken Modem Lag! Enemies, enemy shots, tears, and pickups will briefly freeze in place at random intervals. 3
Buddy in a Box 5.100.518 Buddy in a Box What could it be?! Spawns a familiar with a random tear effect. The familiar is randomized at the start of each floor. 2
Fast Bombs 5.100.517 Fast Bombs Rapid bomb drops +7 BombBombs. Removes the delay between bomb placements, allowing them to be placed rapidly. (in Repentance) Bombs will no longer knock each other away. 1
Lil Delirium 5.100.519 Lil Delirium Delirious friend Grants a familiar that transforms into another random familiar every 10 seconds. 2

Trinkets[ | ]

Name ID Icon Quote Description
Butter! 5.350.122 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 5.350.120 Hairpin Danger charge Fully recharges Isaac's active item upon entering a boss fight.
Wooden Cross 5.350.121 Wooden Cross My faith protects me Grants a shield that negates the first damage taken once per floor.

Cards[ | ]

Name ID Icon Message Description
Huge Growth 5.300.52 Huge Growth Become immense! (except in Repentance) For the current room, makes Isaac larger, allows him to crush obstacles he walks on, and grants +7 flat Damage and +30 Range.
(in Repentance) For the current room, makes Isaac larger, allows him to crush obstacles he walks on, and grants +7 flat Damage and +3 Range.
Ancient Recall 5.300.53 Ancient Recall Draw 3 cards Spawns 3 random cards.
Era Walk 5.300.54 Era Walk Savor the moment For the current room, enemies are slowed, Isaac's speed is increased by 0.50, and his shot speed is decreased by 1.00.

Other Features[ | ]

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.[2]

Active Items[ | ]

Name ID Icon Quote Description (in Repentance) Quality
Coupon 5.100.521
Coupon
6 rooms
Allow 6 weeks for delivery While held, guarantees one item in every ShopShop will be on sale. On use, makes a random item in the current room free. 2
Moving Box 5.100.523
Moving Box
4 rooms
Pack and unpack If the box is empty, picks up 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. (in Repentance) Can carry up to 10 items or pickups at once. 1
Telekinesis 5.100.522
Telekinesis
7 seconds
Power of the mind Upon use, for the next three seconds, any enemy shots that come near Isaac are held in place and then later reflected. 1

Passive Items[ | ]

Name ID Icon Quote Description (in Repentance) Quality
Jumper Cables 5.100.520 Jumper Cables Bloody recharge Grants an active item charge every 15 enemies killed. 3
Leprosy 5.100.525 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. 1
Technology Zero 5.100.524 Technology Zero Static tears! Connects Isaac's tears with electricity that can damage enemies. 3

Trinkets[ | ]

Name ID Icon Quote Description
Filigree Feather 5.350.123 Filigree Feather Angelic spoils Angels drop Angel Room items instead of key pieces when defeated.

Other Features[ | ]

Booster Pack #3[ | ]

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

Active Items[ | ]

Name ID Icon Quote Description (in Repentance) Quality
Mr. ME! 5.100.527
Mr
4 rooms
Caaan do! Summons a controllable ghost that can perform various tasks depending on what it targets. 3

Passive Items[ | ]

Name ID Icon Quote Description (in Repentance) Quality
7 Seals 5.100.526 7 Seals Lil harbingers! Spawns a random Harbinger familiar that changes every 10 seconds. Harbingers have different behaviors and spawn themed Locusts. 2
Angelic Prism 5.100.528 Angelic Prism Eclipsed by the moon Spawns an orbital familiar with a large orbital radius. Tears that pass through the prism split into four multi-colored tears. 3
Pop! 5.100.529 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. 1

Trinkets[ | ]

Name ID Icon Quote Description
Door Stop 5.350.124 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[ | ]

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.[3]

Passive Items[ | ]

Name ID Icon Quote Description (in Repentance) Quality
Death's List 5.100.530 Death's List Just hope you're not next... Grants a pickup or stat upgrade if all enemies in a room are killed in the order they are marked. 2
Haemolacria 5.100.531 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. 4
Lachryphagy 5.100.532 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. 2
Schoolbag 5.100.534 Schoolbag Extra active item room Allows Isaac to hold two active items. 3
Trisagion 5.100.533 Trisagion Smite thy enemy Tears are replaced with piercing white blasts of light that deal less damage but can damage the same enemy multiple times. 3

Trinkets[ | ]

Name ID Icon Quote Description
Extension Cord 5.350.125 Extension Cord Charged friends Bolts of electricity arc between Isaac and his familiars, damaging any enemies between them.

Monsters[ | ]

Entity ID Description
Soul Sucker
Soul Sucker
61.2 Flies slowly towards Isaac. Spawns a vortex that fires four Collectible Brimstone iconBrimstone beams in the cardinal directions upon death.
Cross Stone Shooter
Cross Stone Shooter
202.10 Stationary and invulnerable monster that continuously fires shots in four directions, alternating between cardinal and ordinal.
Tube Worm
Tube Worm
244.1 Pops out of the ground in random locations and fires a long-range spray of arcing shots where Isaac will be.
Tar Boy
Tar Boy
307.0 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 (except in Repentance) fire shots straight upwards out of the Creep underneath Isaac/(in Repentance) send out a tentacle underneath Isaac.
Fistuloid
Fistuloid
308.0 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
309.0 Stationary, harmless enemy that continually creates slowing black creep.

Other Features[ | ]

  • 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[ | ]

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[ | ]

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

Active Items[ | ]

Name ID Icon Quote Description (in Repentance) Quality
Book of the Dead 5.100.545
Book of the Dead
6 rooms
Rise from the grave (except in Repentance) Creates a friendly BonyBony, Black BonyBlack Bony, or an orbital bone for each enemy killed in the current room.
(in Repentance)Creates a friendly BonyBony, Black BonyBlack Bony, Bone FlyBone Fly, RevenantRevenant, or an orbital bone for each enemy killed in the current room.
3
Broken Shovel 5.100.550
Broken Shovel
4 rooms
It feels cursed While held, causes Mom to continuously attempt to stomp on Isaac. Activating makes her stop for the current room or wave. One of two parts necessary to create Collectible Mom's Shovel iconMom's Shovel. 4
Mom's Shovel 5.100.552
Mom's Shovel
4 rooms
Lost but not forgotten Creates a trapdoor that leads to the next floor upon activation. Unlocks Character The Forgotten iconThe Forgotten when used on a mound of dirt that appears in Dark RoomDark Room. 4
Sacrificial Altar 5.100.536
Sacrificial Altar
One time use
He demands a sacrifice Sacrifices up to 2 familiars and spawns an item for each familiar sacrificed. Converts all friendly spiders and flies into coins. 2

Passive Items[ | ]

Name ID Icon Quote Description (in Repentance) Quality
Blanket 5.100.535 Blanket You feel Safe Grants one Soul HeartSoul Heart. Upon entering a boss room, grants a shield that blocks one hit, then disappears. 2
Brittle Bones 5.100.549 Brittle Bones Everything hurts Replaces all Red HeartRed Heart Containers with 6 empty Bone HeartBone Hearts. (except in Repentance) Upon losing a Bone Heart, Isaac fires bones in 8 directions and permanently gains a tears up. (in Repentance) Upon losing a Bone Heart, Isaac fires bones in 8 directions and permanently gains a fire rate up. 3
Broken Shovel 5.100.551 Broken Shovel It feels cursed One of two parts necessary to create Collectible Mom's Shovel iconMom's Shovel. No effect if somehow obtained on its own. 4
Dad's Ring 5.100.546 Dad's Ring Father's blessing Creates a ring of light around Isaac that petrifies enemies in contact. 3
Divorce Papers 5.100.547 Divorce Papers Tears up + you feel empty Grants one Bone HeartBone Heart, +0.7 tears, spawns a Mysterious PaperMysterious Paper. 3
Flat Stone 5.100.540 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. 2
Hallowed Ground 5.100.543 Hallowed Ground Portable sanctuary Spawns a white poop familiar, which turns into a White PoopWhite Poop when Isaac is hurt. White poop has an aura that increases tear fire rate and can block enemy shots. (in Repentance) The aura also increases damage by 20% and gives homing. 1
Jaw Bone 5.100.548 Jaw Bone Fetch! Spawns a familiar that flies through the room while firing, dealing a flat 7 contact damage to enemies and retrieving pickups. 1
Lil Spewer 5.100.537 Lil Spewer Puking buddy Drops a random pill, and spawns a familiar that charges up and fires creep. Using pills changes the creep type. 1
Marbles 5.100.538 Marbles Choking hazard Spawns 3 random trinkets. Taking damage has a 5% chance to swallow Isaac's currently held trinket, gaining its effect permanently. 2
Marrow 5.100.541 Marrow HP up? Grants one Bone HeartBone Heart and spawns three Red HeartRed Hearts. 1
Mystery Egg 5.100.539 Mystery Egg Sacrificial insemination Spawns an egg familiar, which cracks into a random friendly monster when Isaac is hurt. The egg regenerates upon entering a different room. 1
Pointy Rib 5.100.544 Pointy Rib Stabbing time Spawns a bone familiar that hovers back and forth in front of Isaac, dealing damage equal to Isaac's damage. 2
Slipped Rib 5.100.542 Slipped Rib Projectile shield Spawns a bone familiar that circles around Isaac and reflects enemy shots. 2

Trinkets[ | ]

Name ID Icon Quote Description
Baby-Bender 5.350.127 Baby-Bender Feed them magic! Grants Isaac's familiars homing shots.
Finger Bone 5.350.128 Finger Bone It looks brittle Grants a chance to gain a Bone HeartBone Heart upon taking damage.
Rotten Penny 5.350.126 Rotten Penny Wealth of flies Spawns a Blue Fly every time a coin is picked up.

Monsters[ | ]

Entity ID Description
Dank Charger
Dank Charger
23.2 Slowly moves around the room, launching itself at Isaac if he gets in its line of sight. Bounces off of walls and leaves a trail of slowing Black Creep while charging.
Mr. Red Maw
Mr
35.2 Walks towards Isaac and attacks by launching its head towards him. Turns into a Red MawRed Maw or Gusher upon death depending on the killed body segment. Occasionally separates at will.
Crispy
Crispy
226.2 Slowly walks towards Isaac, but increases in speed as they take damage. Constantly passively takes damage.
Cross Stoney
Cross Stoney
302.10 Chases Isaac and shoots 4 tears vertically and diagonally like a Cross Stone ShooterCross Stone Shooter. Dies when the room is cleared.
Only appears in Aprils Fool (challenge #32) as replacements to regular Stoneys.
Leper
Leper
310.0 Alternating between walking towards and running away from Isaac. Releases a Leper Flesh each time it takes enough damage. At low health, constantly chases Isaac and leaves behind damaging red creep. Spawns a Leper Flesh and GusherGusher upon death.
Leper Flesh
Leper Flesh
310.1 Floats slowly toward Isaac and fires a predictive projectile at him upon death.
Mr. Mine
Mr
311.0 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.

Bosses[ | ]

Boss The Matriarch
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 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[ | ]

Trivia[ | ]

  • 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[ | ]


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