Monstro

Base HP	Stage HP
250	0

Ingame Appearance

Entity ID
20.0

Found In
Boss


Double Trouble

(With Another Monstro, The Duke of Flies, Larry Jr. or Fistula)
Degraded Boss

Dropped Items
Boss

This article is about the boss. For the posthumous version, see Monstro II. For the enemy, see Ministro. For the item, see Lil Monstro.

Monstro is a boss that can appear in The Basement and the Burning Basement.

Behavior

• Hops towards Isaac.
• Coughs up a large number of disorganized projectiles towards Isaac. The larger projectiles do one heart of damage while the smaller short-ranged ones do 1/2 heart.
• Jumps off-screen, aiming to land on top of Isaac. Create a burst of disorganized projectiles in all directions on landing.

Champion Versions

• Grey: 15% larger and has 25% more HP (312.5). Uses projectile volleys much more often and is unable to jump off-screen.
• Red: Two 25% smaller Monstros, each with 55% less HP than the original one (112.5), replace the normal Monstro.

Gallery

• 

  Monstro ingame.

• 

  Monstro spewing out projectiles.

• 

  Grey Champion Monstro.

• 

  Grey Champion Monstro spewing out projectiles.

• 

  Red Champion Monstro.

• 

  Red Champion Monstro spewing out projectiles.

• 

  Monstro as one of Delirium's forms.

Arena

• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 

Notes

• In the boss room, Monstro can be paired with Black Flies, Attack Flies, Gapers, Hoppers, Frowning Gapers, Mulligans, Cyclopias, or Ministros.
• When Monstro jumps off-screen, he is cured of all status effects.
• Monstro can't hop over Obstacles.
  • If Isaac is somewhere that Monstro cannot reach, Monstro will jump in place.
  • If Isaac has flight and is over an obstacle, Monstro will essentially be unable to perform any attacks.
    • While Monstro can hit Isaac with his tear barrage because of its tear height, it is very unlikely.
  • This has since been changed in The Binding of Isaac: Repentance.
• Monstro can rarely spawn in a room with two Blood Donation Machines.

Trivia

• Monstro appeared in the original The Binding of Isaac.
• Monstro appears to be missing a tooth which happens to be an item.
  • Monstro also has a cleft lip.
• Monstro is Monster in Portuguese.
  • "Monstro" is a somewhat common mispronunciation of the Spanish word monstruo.
  • Monstro is also the name of The Terrible Dogfish, a fish with a large mouth and many teeth from the book The Adventures of Pinocchio.
• He is the boss version of the Ministros.