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Item icon
Item altar
"Egg tears!"
Table dividing line 1.png
Item ID
Character Appearance
Character appearance
Table dividing line 2.png
Table dividing line 3.png
Collection Grid
Removed in Repentance(page 4, column 16, row 5)
Added in Repentance(page 4, column 17, row 5)
Added in Afterbirth †

Parasitoid is a passive item added in The Binding of Isaac: Afterbirth †.

Effects[edit | edit source]

  • Adds a chance to fire an egg sack which spawns slowing creep. If an egg sack hits an enemy, a Blue Fly or Blue Spider is spawned.
  • Egg sack tears have considerably higher tear height and consequently, range.
  • Added in Repentance This item belongs to the Beelzebub set. Collecting three items from this set will transform Isaac into a giant humanoid fly.
  • Added in Repentance This item belongs to the Spider Baby set. Collecting three items from this set will transform Isaac into a humanoid spider.

Notes[edit | edit source]

  • Egg sacks will also spawn blue flies or spiders if they hit Fireplaces or invincible enemies like Death's Head and Stoney.
  • The chance to fire an egg sack is affected by luck. It is 15% at base luck (0) but cannot reach 100% at high luck.

Synergies[edit | edit source]

Interactions[edit | edit source]

  • Azazel Azazel: Parasitoid has no effect.
  • 15►Brimstone Brimstone: Overrides Parasitoid.
  • 15►Dr. Fetus Dr. Fetus: Overrides Parasitoid.
  • 15►Epic Fetus Epic Fetus: Overrides Parasitoid.
  • 15►Haemolacria Haemolacria: Tears retain Haemolacria appearance and only the main tear can spawn flies or spiders when damaging enemies.
  • 15►Ipecac Ipecac: Only extra range applies on egg sack tears and they will not spawn flies or spiders.
  • 15►Mom's Knife Mom's Knife: Overrides Parasitoid.
  • 15►Tech X Tech X: Overrides Parasitoid.
  • 15►Technology Technology: Overrides Parasitoid.
  • 15►Trisagion Trisagion: Overrides Parasitoid.

In-game Footage[edit | edit source]

Trivia[edit | edit source]

  • Parasitoid is a term for when insects' larvae live inside their hosts as a parasite before eventually killing the host.
  • Added in Repentance Parasitoid is one of the only four items that count towards 2 transformations, the other three being 15►The Bible The Bible, 15►Hive Mind Hive Mind and 15►Magic Mushroom Magic Mushroom.

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