Binding of Isaac: Rebirth Wiki

Added in Afterbirth

Friendly Ball is an activated item added in The Binding of Isaac: Afterbirth.


  • Once thrown, the Friendly Ball will instantly capture any non-boss enemy it hits, removing them from the room.
  • Added in Repentance Walking over a Friendly Ball after it captures an enemy will instantly recharge the item.
  • The next time the Friendly Ball is thrown, it will release the previously captured enemy as a friendly enemy.
    • Released enemies persist between rooms and floors and will follow Isaac until they die.
    • Friendly enemies cannot harm Isaac and do not need to be defeated to clear a room.
    • If Isaac leaves the room before the monster is released, the monster will stay in the ball until it is thrown again.
  • If the Friendly Ball does not capture an enemy, it will simply disappear after a couple seconds being on the ground. The next throw will work the same.


  • All enemies that aren't invincible and are not designated as a boss or mini-boss can be captured by the Friendly Ball. This includes enemies summoned from bosses such as Brownie Brownie's spawned Dip Dips or The Cage The Cage's unique Vis Vises.
    • One exception to this is if you capture a Added in Afterbirth † Portal Portal, as it can spawn enemies such as Death's Head Death's Head.
  • It is generally wasteful to use this item on Mulligan Mulligans and their variants as they will immediately rush towards enemies and try to kill themselves, leaving behind friendly debris.
  • If the captured enemy is a Globin Globin variant (besides Black Globin Black Globins for their lack of regenerative abilities) or a Dark Red Champion, the enemy will regenerate after dying, granting a much longer lifespan.
  • Wall Creep Wall Creeps and their variants stick to walls, backing far away from any potential danger they might encounter.
  • Stationary enemies that move underground (such as Round Worm Round Worms or Lump Lumps) work surprisingly well as an ally as they shoot foes from far away and rarely ever get hurt.
  • Mom's Hand Mom's Hand and Mom's Dead Hand Mom's Dead Hand will both one-shot almost all normal enemies and greatly damage most bosses with an incredibly small window for the hands to be hit, making them ideal for capturing.
  • Brimstone-capable enemies are very potent as their lasers can cause an obscene amount of damage to both enemies and most bosses.
  • If the captured enemy is one that spawns enemies, those enemies will be friendly as well.
  • If the ally is immune to damage (such as a Mobile Host Mobile Host while its head is lowered), it will not take contact damage.
  • If the captured enemy is a Solid White Champion, it will be completely invincible, as it cannot be killed until the room counts as being cleared, at which point it can be killed by spikes or a Wall Hugger Wall Hugger.
  • Added in Afterbirth † If the captured enemy is a Pulsing Red Champion, it will regenerate the health of other monsters in the room, including friendly ones.
  • Removed in Afterbirth † If an enemy that leaves behind a trail of damaging creep is caught, the creep created by the friendly mob will still damage Isaac when he walks over it.
    • Added in Afterbirth † All creep created by a friendly enemy will only hurt grounded enemies and not the player.
  • The ball will only capture one segment of a Grub Grub, one Buttlicker Buttlicker, or one Swarm Swarm Fly. However, when releasing a Swarm Fly, a new swarm is generated for it.
  • If a Mask + Heart Mask + Heart's Heart is caught and then released, a Mask can use the friendly heart to live even if its original heart is destroyed. The room will not be cleared unless the Mask is killed.
    • The mask will ignore the friendly heart yet can still damage it. Bait the mask to charge towards the heart to destroy both.
  • If an Ipecac-capable enemy is caught, the explosive Ipecac shots it fires will not hurt Isaac.
    • This explosion immunity also applies to enemies that explode on death, and even the Troll Bomb Troll Bombs left behind by Mulligoon Mulligoons.
  • The head of Rag Man Rag Man can be captured by the ball while detached. It will not become a Ragling after being released, and only chases enemies by rolling.
  • Added in Repentance Captured Bishop Bishops will protect Isaac with their shield generation ability, as well as all other friendly enemies. Isaac cannot take any damage while the Bishop is alive, as it will protect him with the shield. Protecting the Bishop can be a powerful defensive tool, especially when playing as The Lost The Lost.
  • Added in Repentance Captured Cultist Cultists will revive killed enemies as friendlies, allowing one to slowly amass an army of friendlies by protecting the Cultist.
    • Bosses and degraded bosses can be revived by a friendly Cultist, but will not persist between rooms.


  • The Battery The Battery: Walking over a captured enemy will double charge the ball, allowing the enemy to be released, and allowing to catch a new one in the same room, and the process repeats. This allows the Friendly Ball to be used much, much more often, and gathering many more friends. Note: trying to catch a new enemy while the old one is in the process of spawning will result in the ball phasing thru, catching nothing, thus wasting charge.
  • Added in RepentanceBook of Virtues Book of Virtues: Spawns a wisp, all on the middle ring, whenever a charmed enemy dies. Depending on the enemy that dies, the wisp may have a different effect:
    • Normal: Enemies captured by Friendly Ball spawn this wisp when they die if they wouldn't spawn any of the other variants listed below.
    • Homing: Enemies captured by Friendly Ball spawn this wisp when they die if they were psychic or had homing shots in some way. Wisps' tears are homing.
    • Explosive: Enemies captured by Friendly Ball spawn this wisp when they die if they created explosions in some way. Wisps' tears have a 33% chance to explode. Explosive tears deal no extra damage.
    • Brimstone: Enemies captured by Friendly Ball spawn this wisp when they die if they fired lasers in some way. Wisps fire Brimstone Brimstone lasers. The laser does not need to be charged to be fired, and can tick up to 8 times for a total of 20 damage.


  • Car Battery Car Battery: No effect.
  • Hive Mind Hive Mind: No effect on captured flies or spiders.
  • Skatole Skatole or Bursting Sack Bursting Sack: Friendly Fly/Spider enemies will be unable able to shoot, slowed down, and/or reverted to a weaker form, hindering this item's effectiveness on those enemies.
  • Added in RepentanceVoid Void: Walking over a thrown Friendly Ball that captured an enemy will not recharge Void.

In-game Footage[]



  • The item is a reference to Poké Balls from the Pokémon franchise. Ironically, it doesn't at all resemble the actual Friend Ball in the franchise.


PC Hard mode only MF7L HXQV (Treasure Room adjacent to spawn)

Switch Greed mode only 0JV6 C0XG (First Golden Treasure Room)


Bug Bug! Removed in Afterbirth † Certain monsters will not spawn friendly enemies when defeated:
Bug Bug! Removed in Afterbirth † Using Glowing Hour Glass Glowing Hour Glass will duplicate friendly enemies upon use.