Parasitoid is a passive item added in The Binding of Isaac: Afterbirth †.
Effects[ | ]
- Adds a chance to fire an egg sack which spawns slowing creep. If an egg sack hits an enemy, one to two Blue Flies or Blue Spider is spawned.
- Egg sack tears have
x2 range/ x2 tear height (which also increases effective range). - This item belongs to the Beelzebub set. Collecting three items from this set will transform Isaac into a giant humanoid fly.
- This item belongs to the Spider Baby set. Collecting three items from this set will transform Isaac into a humanoid spider.
x2 
x2 
Notes[ | ]
- The chance to shoot egg sacs depends on the luck stat and is based on this formula:
- At base luck (0), the chance is 14.29%, maxing out at 50% at 5 luck.
- Egg sacks will also spawn blue flies or spiders if they hit Fire Places or invincible enemies like Death's Head and Stoney.
- It is possible to create a large number of Spiders and Flies by repeatedly shooting a closed Host.
Synergies[ | ]
- C Section: Parasitoid fetuses spawn spiders/flies and slowing creep with every hit on an enemy.
- Compound Fracture / Cricket's Body / The Parasite: When egg sacks are fired, they will split into smaller egg sacks. Split egg sacks from The Parasite will not look like egg sacks.
- Cupid's Arrow: Egg sacks will apply their effect to every enemy hit.
- Fire Mind / Explosivo : If the explosion effect triggers on an egg sack, it will produce a much larger pool of slowing creep.
- Hive Mind: Flies and spiders are bigger and deal double damage.
Interactions[ | ]
Overrides Parasitoid:
Other interactions:
- Dr. Fetus: Bomb explosions have a chance of leaving the slowing creep in a larger pool than egg sack tears, however the egg sack bombs can't spawn Blue Flies/Blue Spiders.
- Fish Tail: The duplicated flies will spawn on top of the enemy and deal damage immediately.
- Haemolacria: Tears retain Haemolacria appearance and only the main tear can spawn flies or spiders when damaging enemies.
- Ipecac: Only extra range applies on egg sack tears and they will not spawn flies or spiders.
- Montezuma's Revenge/Revelation: No effect.
- Spirit Sword: The sword projectiles can still spawn flies and spiders, but the swings themselves won't.
- Tech.5/Technology 2: Lasers are unaffected.
In-game Footage[ | ]
Trivia[ | ]
- Parasitoid is a term for when insects' larvae live inside their hosts as a parasite before eventually killing the host.
- Parasitoid is one of the only five items that count towards 2 transformations, the other four being Skatole, The Bible, Hive Mind and Magic Mushroom.
 The Binding of Isaac: Rebirth
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