Box of Friends

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Box of Friends is an unlockable activated item added in Afterbirth.

Effect

• Upon use, it adds one copy of each of Isaac's familiars for the duration of the current room.
• If Isaac has no familiars, a Demon Baby will spawn for the duration of the current room.

Notes

• Lilith starts with this item by default, even if it hasn't been unlocked yet.
• If Isaac has more than one copy of the same familiar, it will still only add one copy.
• Blue Flies, Blue Spiders, Pretty Flies, Dead Bird, and Leprosy body parts are not replicated.
• Many familiars can be spawned in Greed Mode and Boss Rush, as completing waves charges the item.

Interactions

• 1up! / Dead Cat: Familiars are multiplied but do not give Isaac additional lives.
• Best Bud: If used before taking damage, the white fly will circle around Isaac. However, multiple white flies cannot be spawned, so using Box of Friends after taking damage or using it multiple times in a room has no effect.
• Bob's Brain: Adds an additional brain. When used upon entering a room, Box of Friends eliminates the item delay, which allows Isaac to launch Bob's Brain immediately.
• Cube of Meat / Ball of Bandages: Upgrades the cube/ball for the current room. This can be used to easily unlock the Super Meat Boy and Bandage Girl achievements.
• Daddy Longlegs: Familiar will be copied.
• Pickup generating familiars: The copied familiars will drop pickups independently.
• Guillotine: Duplicates the Head circling around Isaac's body. Only one head will shoot tears.
• Isaac's Heart / / / Milk!: These familiars are not copied.
  • In the case of Milk!, the familiar itself doesn't appear, but instead it decreases tear delay by 2 (effective tears up) when used, without needing to take damage.
• Key Piece 1 / Key Piece 2: Key pieces are multiplied, but do not complete the other half.
• Smart Fly: Very useful on Greed mode, as each usage will add an attacking fly, killing enemies and bosses very quickly.
• Car Battery: Adds two copies of each familiar.
• Incubus: Multiple Incubi which share the same tear modifiers as the player.
• Multidimensional Baby: Each copy of Multidimensional Baby follows the previous copy with a 2.5 second delay.
• Acid Baby: Two or more pills will spawn where applicable.

Trivia

• The Box of Friends seems to resemble the Lament Configuration of the Lemarchand's box from Clive Barker's Hellraiser.
• Might be a very obscure reference to a Yu-Gi-Oh! card with the same name.
• This item used to have a recharge time of 2, until an update on November 4th, 2015.
• When playing in Korean, this item still has a recharge time of 2.

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