Monstro

Boss Double Trouble (With Another Monstro, The Duke of Flies, or Fistula) Degraded Boss
Boss

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

Monstro is one of the bosses that can appear in The Basement and the Burning Basement. He is amongst the most common to fight, particularly because he can appear on later floors as an enemy.

Behavior

• Hops towards the player.
• Coughs up a large amount of disorganized tears. The larger tears do one heart of damage while the short ranged small ones do 1/2 heart.
• Jumps off-screen, aiming to land on top of the player.
  • Fires another set of disorganized tears after landing.

Champion Versions

• Red: Two smaller Monstros, each with 45% of Monstro's normal health, replace the normal Monstro.
• Dark Grey: Slightly larger and has 25% more health. Uses tear volleys much more often and is unable to jump off-screen.

Gallery

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  Monstro ingame.

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  Monstro spewing out projectiles.

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  Monstro as one of Delirium's forms.

Arena

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Notes

• In the boss room, Monstro can be paired with Black Flies, Attack Flies, Gapers, Hoppers, Frowning Gapers, Mulligans, Cyclopias, or Ministros.
• Monstro can't hop over Obstacles.
• When Monstro jumps off-screen, he is cured of all status effects.
• If Isaac is somewhere that Monstro cannot reach, Monstro will jump in place.
• 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.