Jar of Flies

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Jar   of   Flies
Removed in Afterbirth †Item icon
Added in Afterbirth †Item icon
Item altar
"Gotta catch 'em all?"
Table dividing line 1.png
Item ID
5.100.434
Table dividing line 2.png
Recharge Time
Unlimited Unlimited
Table dividing line 3.png
Collection Grid
Added in Afterbirth † / Removed in Repentance(page 4, column 9, row 4)
Removed in Afterbirth †(page 4, column 9, row 4)
Added in Repentance(page 4, column 10, 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 Beelzebub 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 15►Incubus Incubus) 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 15►Friendly Ball Friendly Ball 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 as 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.

Synergies[edit | edit source]

  • 15►Hive Mind Hive Mind: Flies are bigger and deal double damage.
  • Added in Afterbirth †Fish Tail Fish Tail: Doubles the number of flies that spawn.
  • Added in Afterbirth †15►Schoolbag Schoolbag: Flies will be gained even while the Jar of Flies is in the inactive slot.

Interactions[edit | edit source]

  • 15►Car Battery Car Battery: No effect.
  • Added in Afterbirth †15►Void Void: Flies will not collect when absorbed by Void, making the interaction worthless.
  • Added in Repentance15►4.5 Volt 4.5 Volt: No effect.

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 on 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 15►The Ludovico Technique The Ludovico Technique with 15►Brimstone Brimstone or 15►Technology Technology will not spawn flies.


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