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.
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]
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.
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.
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.
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.
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.
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.
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.
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]
Spawns a white poop familiar, which turns into a white poop when Isaac is hurt. White poop has an aura that halves tear delay and can block enemy shots.
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.
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.
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.
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.
Jar of Flies now changes appearance depending on how many flies are in the jar, based on this Steam Workshop mod.
Broken Modem collectible sprite was changed.
Technology Zero collectible and costume sprites were changed.
Angry Fly collectible and familiar sprites were changed.
Sprinkler collectible and entity sprites were changed.
7 Seals collectible and familiar sprites were changed. Familiar sprites were based on this Steam Workshop mod by Quartz.
Pop! collectible sprite was changed.
Hairpin trinket sprite was changed.
Butter! trinket sprite was changed.
Door Stop trinket sprite was changed.
Dark Room.
The Binding of Isaac: Rebirth 
Achievements
Attributes
Bosses
Cards and Runes
Challenges
Chapters
Characters
Co-op
Items
Item pools
Monsters
Objects
Pickups
Pills
Rooms
Seeds
Transformations
Trinkets
