Utero is the alternate floor of The Womb, and looks exactly the same. The only difference is the variety of enemies and bosses that appear. This floor was added in the Wrath of the Lamb DLC.
Rooms
- 1: The room will always appear once in this floor
- 2: The room will always appear twice in this floor
- Possible: There is a chance for this room to appear, usually due to certain criteria being met
- -: The room cannot appear in this floor.
Rooms from the core game | ||||
Rooms | Utero 1 | Utero 2 | Utero XL | Note |
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Regular Rooms | 22 - 26 | 22 - 26 | 39 - 40 | |
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- | - | - | From The Womb/Utero and onwards, no more Treasure Rooms will appear. |
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Possible | Possible | Possible | Shops randomly appear in rare cases, higher chance if Steam Sale is owned. |
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1 | 1 | 1 | |
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1 | 1 | 2 | Boss Rooms are always linked in XL floors. |
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Possible | Possible | Possible | Will only be generated if Isaac has full health while entering the floor. |
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- | Possible | Possible | Only generated when Isaac has 5 Coins upon entering a new floor or part. |
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Possible | Possible | Possible | If the Devil Room is entered at Utero 2/Utero XL, there will be a trapdoor leading to Sheol instead of items being sold for Heart Containers. The trapdoor appears even if the player has not killed It Lives!. |
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Possible | Possible | Possible | Only reachable by using the Telepills, which have a 6.66% chance to teleport Isaac to this room. |
Rooms with Wrath of the Lamb | ||||
Rooms | Utero 1 | Utero 2 | Utero XL | Note |
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1 | 1 | 1 | |
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Possible | Possible | Possible | |
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Possible | Possible | Possible | |
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Possible | Possible | Possible | If the Angel Room is entered at Utero 2/Utero XL, there will be a trapdoor leading to Sheol instead of an item at a pedestal. The trapdoor appears even if the player has not killed It Lives!. |
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Possible | Possible | Possible | 5% base chance to spawn, 25% if Isaac is holding a book. |
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Possible | Possible | Possible |
Monsters
Monster | Description | WotL DLC |
---|---|---|
Fat Fly![]() |
Alternate version of Pooters![]() |
✔ |
Spit![]() |
Flies slowly towards Isaac, exploding into an IPECAC shot upon death which targets other Spits in the room, or Isaac. | ✔ |
Spider![]() |
Moves erratically around the room, damaging Isaac by touch. | ✔ |
Big Spider![]() |
Moves erratically around the room, splitting into two Spiders![]() |
✔ |
Gazing Globin![]() |
Quickly walks towards Isaac, dealing one heart of contact damage. Turns into a pile of goo and slides away after taking enough damage, where it can be killed. Will regenerate after a short amount of time if not killed quickly. | |
Mask + Heart |
Invulnerable mask with a slow-moving Heart. Functions similarly to a Knight. The Heart fires 4 blood shots in a plus pattern when Isaac gets near. Killing the Heart will automatically kill the Mask. | ✔ |
Clotty![]() |
Moves around the room, firing 4 blood shots in a plus pattern. | |
Clot![]() |
Moves around the room, firing 4 tar shots in an X pattern. | |
Brain![]() |
Crawls around the room, leaving a trail of red Creep that does one heart of damage. | |
Guts![]() |
Attaches itself to a wall or obstacle, such as a Rock, rolling around the room. | |
Mama Guts![]() |
Slowly moves around the room, occassionally hopping and firing 8 large blood shots in all directions. Will split into 2 Guts![]() |
✔ |
Para-Bite![]() |
Moves towards Isaac. Can burrow underground and reappear elsewhere. | |
Fred![]() |
Fires an IPECAC shot at Isaac. Will hop out of the ground and burrow elsewhere, firing 4 blood shots in an X pattern while doing so. | |
Lump![]() |
Fires 3 fast-moving blood shots at Isaac when he gets in its line of sight. Will burrow underground and reappear elsewhere after firing its shots. | |
Leech![]() |
Quickly charges towards Isaac when he gets in its line of sight. | |
Kamikaze Leech![]() |
Quickly charges towards Isaac when he gets in its line of sight. Explodes with a large blast radius upon death. | |
Holy Leech![]() |
Quickly charges towards Isaac when he gets in its line of sight. Explodes with a large blast radius upon death. Has an Eternal Fly![]() |
✔ |
Double Vis![]() |
Charges up a Brimstone laser which fires from both sides when Isaac gets in its line of sight. | ✔ |
Eye![]() |
Quickly fires a Technology-like laser at Isaac. | |
Bloodshot Eye![]() |
Quickly fires a Brimstone-like laser at Isaac. | |
Dople![]() |
Copies Isaac's movements, and fires tears at the same time as him. | |
Evil Twin![]() |
Copies Isaac's movements, and fires tears at the same time as him. | |
Baby![]() |
Fires a single blood shot at Isaac. Can teleport and reappear elsewhere. | |
Angelic Baby![]() |
Fires 3 blood shots at once at Isaac, has much more health than regular Babies. | ✔ |
Vomit Grimace![]() |
Stationary and invulnerable monster that fires an IPECAC shot at Isaac. Stops firing when room is cleared. | ✔ |
Minibosses (7 Sins) found in normal rooms: | ||
Wrath![]() |
Usually paired with another Wrath. Fires Bombs at Isaac that detonate after a short amount of time, in a manner similar to Dr. Fetus. | |
Sloth![]() |
Usually paired with another Sloth. Fires IPECAC shots at Isaac, while occasionally spawning Chargers![]() |
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Envy![]() |
Usually paired with another Envy. Moves around the room slowly at first, and then splits into two faster-moving heads after taking enough damage. These heads will split into two more heads with a smaller size and increased speed after taking enough damage, which will then split into the smallest heads that do not split. | |
Bosses found in normal rooms: | ||
Blastocyst![]() |
Hops around the room, firing 4 large blood shots in a + pattern. Splits into two smaller parts upon taking enough damage, and into an Embyro at the end. | |
Gemini![]() |
Two joined twins that compose 50% of the health bar each. The large twin runs towards Isaac, while the smaller twin fires fast-moving blood shots. The smaller twin will stop firing blood shots upon the larger twin's death, and instead start chasing Isaac. | |
Fistula![]() |
Floats around the room diagonally, splitting into smaller, faster versions every time it takes damage. Smallest versions spawn a Charger![]() |
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Gurdy Jr.![]() |
Spawns Pooters regularly, and can fire blood shots in all 8 directions. Will occasionally charge towards Isaac at very high speeds, bouncing off walls. | ✔ |
The Husk![]() |
Moves around the room diagonally, spawning Flies and firing a large number of blood shots in short intervals. | ✔ |
The Hollow![]() |
Two multi-segmented enemies that fly around the room diagonally, damaging Isaac by contact. All of the segments have to be destroyed for the boss to be killed. | ✔ |
Loki![]() |
Constantly fires 4 blood shots in a plus or cross pattern, and sometimes in all 8 directions at once. Occasionally teleports around the room. Can spawn Boom Flies![]() |
Bosses
Triachnid (Daddy Long Legs' Alt)
Death (Horseman of the Apocalypse)
Conquest (Death's Alt)
Mom's Heart (Final boss of Utero)
It Lives (Mom's Heart Alt)
Room-layouts
Rebirth
Trivia
- The name of this floor is based off a Uterus, the organ in the lower body of a woman or female mammal where offspring are conceived and in which they gestate before birth; the womb.
Chapters | |||||
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Chapter 1 | Chapter 2 | Chapter 3 | Chapter 4 | Chapter 5 | Chapter 6 |
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