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]
Enemies, enemy shots, tears, and pickups will briefly freeze in place at random intervals. The reward from clearing a room will sometimes be duplicated.
For the current room, makes Isaac larger, allows him to crush obstacles he walks on, and grants +7 flat Damage and +30 Range. For the current room, makes Isaac larger, allows him to crush obstacles he walks on, and grants +7 flat Damage and +3 Range.
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. Can carry up to 10 items or pickups at once.
Taking damage grants a body part orbital that blocks shots and deals contact damage, up to a maximum of three. The body parts are destroyed after blocking enough damage.
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.
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.
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.
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/ send out a tentacle underneath Isaac.
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.
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.
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 Mom's Shovel.
Replaces all Red Heart Containers with 6 empty Bone Hearts. Upon losing a Bone Heart, Isaac fires bones in 8 directions and permanently gains a tears up. Upon losing a Bone Heart, Isaac fires bones in 8 directions and permanently gains a fire rate up.
Spawns a white poop familiar, which turns into a White Poop when Isaac is hurt. White poop has an aura that increases tear fire rate and can block enemy shots. The aura also increases damage by 20% and gives homing.
Spawns an egg familiar, which hatches a random friendlymonster when Isaac is hurt once per room. The power of the monster improves for each consecutive room cleared without taking damage.
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.
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.
Chases Isaac and shoots 4 tears vertically and diagonally like a Cross Stone Shooter. Dies when the room is cleared. Only appears in Aprils Fool (challenge #32) as replacements to regular Stoneys.
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 Gusher upon death.
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.
Quality
A Lump of Coal or 
The Poop instead.
Soul Heart. Enemies can randomly become briefly charmed or feared. Taking damage has a chance to spawn a 
Rainbow Poop.
Bombs. Removes the delay between bomb placements, allowing them to be placed rapidly. 
For the current room, makes Isaac larger, allows him to crush obstacles he walks on, and grants +7 flat Damage and +30 Range.
Shop will be on sale. On use, makes a random item in the current room free.
Jar of Flies now changes appearance depending on how many flies are in the jar, based on this Steam Workshop mod.
Brimstone beams in the cardinal directions upon death.
Bony, 
Black Bony, or an orbital bone for each enemy killed in the current room.
Bone Fly, 
Revenant, or an orbital bone for each enemy killed in the current room.
Mom's Shovel.
The Forgotten when used on a mound of dirt that appears in 
Dark Room.
Red Heart Containers with 6 empty 
Bone Hearts. 
Mysterious Paper.
White Poop when Isaac is hurt. White poop has an aura that increases tear fire rate and can block enemy shots. 
Red Maw or Gusher upon death depending on the killed body segment. Occasionally separates at will.
Cross Stone Shooter. Dies when the room is cleared.
Gusher upon death.
The Binding of Isaac: Rebirth
