Jar of Flies

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Removed in Afterbirth †Item icon
Added in Afterbirth †Item icon
Item altar
 
 
 
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434
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Unlimited Unlimited
 
Shop Shop
Greed mode only Shop Shop
Greed mode only Treasure Room Treasure Room
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Added in Afterbirth †(page 4, column 9, row 4)
Removed in Afterbirth †(page 4, column 9, row 4)
Added in  Afterbirth

Jar of Flies is an activated item added in The Binding of Isaac: Afterbirth.

Effects[edit | edit source]

  • Killing an enemy adds a fly to the jar, up to a maximum of 20.
  • Upon use, releases blue flies equal to the number of flies in the jar.
  • This item belongs to the BeelzebubBeelzebub App.pngGrants flight and converts small enemy flies into blue flies. set. Collecting three items from this set will transform Isaac into a giant humanoid fly.

Notes[edit | edit source]

  • Kills by blue flies and locusts (including flies from the jar) and shooting familiars (including Incubus IncubusIncubus Icon.pngA demonic familiar that follows Isaac and shoots tears identical to Isaac's in terms of damage, range, fire rate, and effects.) do not add flies to the jar.
  • Blue spiders, orbital familiars, and chasing familiars do add flies to the jar.
  • Friendly enemies such as from the Friendly Ball Friendly BallFriendly Ball Icon.png3 roomsThrowing the ball at an enemy instantly kills it and captures it. The captured enemy can later be released and will be friendly, fighting for Isaac and persisting between rooms. add flies to the jar, but not those spawned from other enemies.
  • Batteries do not affect the number of flies in the jar.
  • Enemies must be actually killed to add a fly; transformations (such as Gapers turning into Pacers) or knockouts (such as incapacitating a Globin) do not count as kills.
  • Destroying a shopkeeper will count a kill.
  • With items that kill normally unkillable enemies, killing things like Stone Grimaces will add flies to the jar.
  • Killing minions in the Hush fight does not add flies to the jar.

Interactions[edit | edit source]

  • Car Battery Car BatteryCar Battery Icon.pngCauses Isaac's activated item to activate twice on each use.: No effect.
  • Added in Afterbirth †Void VoidVoid Icon.png6 roomsConsumes all pedestal items in the room. Active items will have their effects added to Void, and passive items will grant stat upgrades.: Flies will not collect when absorbed by Void, making the interaction worthless.

Synergies[edit | edit source]

  • Hive Mind Hive MindHive Mind Icon.pngIncreases the size of blue spiders and blue flies and doubles the amount of damage they deal.: Flies are bigger and deal double damage.
  • Added in Afterbirth †Fish Tail Fish TailFish Tail Icon.pngItems and trinkets that generate blue flies or blue spiders will generate twice as many.: Doubles the number of flies that spawn.
  • Added in Afterbirth †Schoolbag SchoolbagSchoolbag Icon.pngAllows Isaac to hold two active items.: Flies will be gained even while the Jar of Flies is in the inactive slot.

In-game Footage[edit | edit source]

Trivia[edit | edit source]

  • The item's pickup quote references the tagline of the Pokémon games.
  • Added in Afterbirth † With Booster Pack #2, this item's sprite fills up with more flies depending on how many flies it contains. This is based off of this Steam Workshop mod by Stewartisme.
  • The item is likely a reference to the Alice In Chains album of the same name.

Seeds[edit | edit source]

 PC  KTHW HTAY (First floor, in the shop)

Bugs[edit | edit source]

Bug Bug! The synergy of The Ludovico Technique The Ludovico TechniqueThe Ludovico Technique Icon.pngInstead of firing tears, Isaac controls one floating tear that hover over obstacles. This tear deals constant damage when held in place over an enemy. and Brimstone BrimstoneBrimstone Rebirth Icon.pngTears are replaced by a laser beam that pierces through all enemies and obstacles in its path and deals high damage. Can only be fired after a short charge-up period. will not spawn flies.


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