Monstro

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 Basement and the Burning Basement.

Behavior[]

Hops towards Isaac.
Coughs up a large number of disorganized projectiles towards Isaac.
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 20% 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[]

Note: Layouts 1 and 11 are identical. Layouts 8 and 9 no longer appear, as small boss rooms have been disabled.

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.
Monstro can rarely spawn in a room with two Blood Donation Machines.
Monstro will spawn in ??? if IV - The Emperor? is used. Defeating Monstro this way will count as defeating Hush for completion mark purposes.

Trivia[]

Monstro appeared in the original The Binding of Isaac.
He is the boss version of the Ministros.
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.
Monstro has a new fallback animation.

Bosses
Chapter 1	Gemini • Steven • Blighted Ovum • Dingle • The Duke of Flies • Famine • Gurglings • The Haunt • Larry Jr. • Monstro • Pin • Widow • The Fallen • The Headless Horseman Dangle • Little Horn • Rag Man • Turdlings Baby Plum
Chapter 1.5	Lil Blub • Wormwood • The Rainmaker • Min-Min • Clog • Colostomia • Turdlet
Chapter 2	Fistula • Chub • C.H.A.D. • Carrion Queen • Dark One • Gurdy • Gurdy Jr. • The Hollow • The Husk • Mega Fatty • Mega Maw • Peep • Pestilence • Polycephalus • The Wretched • The Fallen • The Headless Horseman The Forsaken • The Frail • The Stain Big Horn • Rag Mega Bumbino
Chapter 2.5	Reap Creep • Tuff Twins • Hornfel • Great Gideon • Singe • The Shell • The Pile
Chapter 3	The Adversary • The Bloat • The Cage • The Gate • Monstro II • Gish • Loki • Mask of Infamy • War • The Fallen • The Headless Horseman • Mom Brownie Sisters Vis Reap Creep • The Pile
Chapter 3.5	The Siren • The Heretic • The Visage • The Horny Boys • Mom • Mom's Heart
Chapter 4	Blastocyst • The Bloat • Conquest • Daddy Long Legs • Triachnid • Death • Lokii • Mama Gurdy • Mr. Fred • Scolex • Teratoma • The Fallen • The Headless Horseman • Mom's Heart • It Lives Sisters Vis • The Matriarch
???	Hush
Corpse	Chimera • The Scourge • Rotgut • Mother
Chapter 5	Satan • Isaac
Chapter 6	??? • The Lamb • Mega Satan
The Void	Delirium
Home	Dogma • The Beast • Ultra Death • Ultra Famine • Ultra Pestilence • Ultra War
Greed Mode	Ultra Greed Ultra Greedier

The Binding of Isaac: Rebirth
Achievements	Attributes	Bosses	Cards and Runes	Challenges	Chapters
Characters	Co-op	Items	Item pools	Monsters	Objects
Pickups	Pills	Rooms	Seeds	Transformations	Trinkets