Necropolis is the alternate floor for the third chapter, The Depths. It appears similar to the depths with pits, spikes, sentries and key tiles, except the walls are coated with pillars. There are many new monsters and bosses that make their debut here.
Isaac on Necropolis I.
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
- *: This room can only appear due to a bug or a special item
- -: The room cannot appear in this floor.
| Rooms in core game | ||||
| Rooms | Necropolis 1 | Necropolis 2 | Necropolis XL | Note |
|---|---|---|---|---|
| Regular Rooms | - | - | - | |
 Treasure Room
|
1 | 1 | 2 | |
 Shop
|
1 | 1 | 1 | There is always one shop, even in XL floors. |
 Secret Room
|
1 | 1 | 1 | |
 Boss Room
|
1 | 1 | 2 | Boss Rooms are always linked in XL floors. |
 Challenge Room
|
Possible | Possible | Possible | Will only be generated if Isaac has full health while entering the floor. |
 Arcade
|
Possible | Possible | Possible | Only generated when Isaac has 5 Coins upon entering a new floor or part. |
 Devil Room
|
Possible |
Possible |
Possible | After fighting Mom, a Devil Room can appear and the sound will still play, but it is not possible to enter it as no door will appear. Using The Joker Card or teleporting out of the Boss Room and re-entering will allow you to enter the room. |
| I AM ERROR
|
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 | Necropolis 1 | Necropolis 2 | Necropolis XL | Note |
| Super Secret Room
|
1 | 1 | 1 | |
 Curse Room
|
Possible | Possible | Possible | |
 Sacrifice Room
|
Possible | Possible | Possible | |
 Angel Room
|
Possible | Possible | Possible | After fighting Mom, a Devil Room can appear and the sound will still play, but it is not possible to enter it as no door will appear. Using The Joker Card or teleporting out of the Boss Room and re-entering will allow you to enter the room. |
 Library
|
Possible | Possible | Possible | 5% base chance to spawn, 25% if Isaac is holding a book. |
 Boss Challenge Room
|
Possible | Possible | Possible | |
Monsters
| Monster | Description | WotL DLC |
|---|---|---|
Eternal Fly
|
Invulnerable Fly that circles Corny Poop , Holy Leeches or Hangers .
|
✔ |
Fat Fly
|
Alternate version of Pooters . Fires 2 shots in a V-formation and does not deal touch damage.
|
✔ |
Red Boom Fly
|
Flies around the room diagonally, dealing touch damage and exploding into 6 directional blood shots upon death. | |
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 upon death.
|
✔ |
Gut
|
Stationary enemy that shrinks upon being hit. Will quickly swell up if not killed in time. Fires an IPECAC shot at Isaac when fully swollen. | ✔ |
Sack
|
Stationary enemy that shrinks upon being hit. Swells up slower than Guts and Boils. Spawns a Spider when fully swollen.
|
✔ |
Walking Boil
|
Mobile Boil that cannot shrink, but has a finite amount of health. Fires short-ranged blood shots with varying sizes at a reduced fire rate. | ✔ |
Walking Gut
|
Mobile Gut that cannot shrink, but has a finite amount of health. Fires IPECAC shots at a reduced fire rate. | ✔ |
Walking Sack
|
Mobile Sack that cannot shrink, but has a finite amount of health. Spawns Spiders.
|
✔ |
Hive
|
Walks around the room, avoiding Isaac while spawning Attack Flies . Spawns a large number of Flies upon death.
|
|
Swarmer
|
Slowly floats around the room, spawning a Pooter upon taking damage. Spawns a large number of Flies upon death. | ✔ |
Leaper
|
Jumps around the room quickly, but not as fast as F. Hoppers. Occasionally jumps high into the air, dropping down elsewhere while firing 4 blood shots in a plus pattern. | |
Gurgle
|
Slowly walks towards Isaac, firing short-ranged IPECAC shots at him. Has much more health than regular Gapers. | ✔ |
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. | ✔ |
B. Licker
|
Attaches itself to other B. Lickers, erratically moving around the room, similar to Larry Jr. | ✔ |
Kamikaze Leech
|
Quickly charges towards Isaac when he gets in its line of sight. Explodes with a large blast radius upon death. | |
Double Vis
|
Charges up a Brimstone laser which fires from both sides when Isaac gets in its line of sight. | ✔ |
Chubber
|
Fires a Little Chubby-like familiar that deals one heart of damage when Isaac gets in its line of sight. | ✔ |
Slide
|
Quickly slides towards Isaac when he gets in front of it. | ✔ |
Keeper
|
Hops around the room, firing 2 blood shots in a V formation at Isaac. | ✔ |
| Hanger
|
Floats around the room, firing 3 blood shots at Isaac. Has an Eternal Fly circling it.
|
✔ |
Stone Grimace
|
Stationary and invulnerable mosnter that fires a fast-moving blood shot at Isaac. Stops firing when room is cleared. | |
Vomit Grimace
|
Stationary and invulnerable monster that fires an IPECAC shot at Isaac. Stops firing when room is cleared. | ✔ |
| Bosses found in normal rooms: | ||
Embryo
|
Aimlessly hops around the room, damaging Isaac by contact damage. | |
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. | |
Fistula
|
Floats around the room diagonally, splitting into smaller, faster versions every time it takes damage. Smallest versions spawn a Charger when killed. | |
Chub
|
Moves around the room randomly, charging at Isaac if he gets in her line of sight. Constantly spawns Chargers .
|
|
|
Headless Horseman (Head only) |
Charges around the room 3 times, in a pattern similar to War. Occasionally fires 3 blood shots at Isaac at once. | |
Bosses encountered in regular rooms:
- Fistula (small and medium version)
- Headless Horseman (heads only)
Bosses
Trivia
- The music of this level is very similar to the music in the Larries Lament level of Super Meat Boy.
- Necropolis 2 is unnumbered. However, sliding your mouse around the name will reveal the "2". This also applies to Necropolis XL.
| Chapters | |||||
|---|---|---|---|---|---|
| Chapter 1 | Chapter 2 | Chapter 3 | Chapter 4 | Chapter 5 | Chapter 6 |
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