Binding of Isaac: Rebirth Wiki
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Necropolis is the alternative chapter of the DepthsDepths. It is a dark environment infested with insects.

Necropolis is unlocked by defeating every boss from The Depths at least once.

The boss of Necropolis II is always Boss Mom ingameMom.

(in Repentance) After A Secret Exit A Secret Exit is unlocked, a door will appear in Necropolis I's Boss RoomBoss Room upon defeating the boss, leading to the MausoleumMausoleum / GehennaGehenna. This door requires two hearts to be opened (except on Lost characters). Unlike Angel RoomAngel Rooms and Devil RoomDevil Rooms, this door never disappears. Also after this achievement is unlocked, a Strange Door in the starting room of Necropolis II will appear. This door leads to MausoleumMausoleum / GehennaGehenna II before entering the Ascent.

Monsters[ | ]

Entity ID Description
Baby
Baby
38.0 Slowly floats towards Isaac and fires a blood shot at him. Occasionally teleports and reappears elsewhere.
Begotten
Begotten
251.0 Starts attached to the wall or an (in Afterbirth † and Repentance) obstacle. After a while, it detaches, firing 6 blood shots in all directions, turning the room dark, becoming invisible and chasing Isaac. Briefly becomes visible upon getting hit.
Boil
Boil
30.0 Stationary enemy that decreases in size when hit, but regenerates to its full size until fully destroyed. Fires multiple short-ranged blood projectiles in random directions when fully swollen.
Gut
Gut
30.1 Stationary enemy that decreases in size when hit, but regenerates to its full size until fully destroyed. Fires Collectible Ipecac iconIpecac shots in random directions when fully swollen.
Sack
Sack
30.2 Stationary enemy that decreases in size when hit, but regenerates to its full size until fully destroyed. Occasionally spawns SpiderSpiders when fully swollen.
Walking Boil
Walking Boil
88.0 Does not shrink or regenerate. Walks around aimlessly and fires multiple short-ranged blood projectiles in random directions.
Walking Gut
Walking Gut
88.1 Does not shrink or regenerate. Walks around aimlessly and fires Collectible Ipecac iconIpecac shots in random directions.
Walking Sack
Walking Sack
88.2 Does not shrink or regenerate. Walks around aimlessly and occasionally spawns SpiderSpiders.
Bony
Bony
227.0 Wanders around the room and throws a bone at Isaac when he is in sight.
Death's Head
Death's Head
212.0 Invulnerable enemy that moves diagonally around the room, dealing contact damage. Dies when the room is cleared.
Brain
Brain
32.0 Slowly crawls around the room, leaving a trail of Red Creep.
Buttlicker
Buttlicker
89.0 Can start attached to other Buttlickers and erratically moves around the room, similar to Boss Larry Jr. ingameLarry Jr..
I.Blob
I
15.2 Randomly wanders around the room, firing 8 shots in all directions.
Dip
Dip
217.0 Slowly dashes in random directions, dealing contact damage.
Squirt
Squirt
220.0 Dashes towards Isaac and deals contact damage. Spawns 2 Dips upon death.
Dinga
Dinga
223.0 Slowly moves around the room, occasionally hopping to spawn DipDips or fire 8 Brown shots in all directions. Splits 2 SquirtSquirts upon death.
Embryo
Embryo
77.0 Aimlessly hops around the room, dealing contact damage.
Pale Fatty
Pale Fatty
208.1 Slowly walks towards Isaac. Occasionally farts and shoots 6 blood shots in all directions. Has a chance to turn into a Blubber upon death.
Fat Sack
Fat Sack
209.0 Slowly walks towards Isaac. Occasionally leaps off-screen and attempts to land on Isaac, leaving a puddle of Red Creep and shooting 6 blood shots in all directions where it lands. Has a chance to turn into a Blubber upon death.
Blubber
Blubber
210.0 Walks around aimlessly and randomly spews a cluster of blood shots in all directions. Has a chance to turn into a Half Sack when killed.
Half Sack
Half Sack
211.0 Wanders around aimlessly and leaves a trail of Red Creep.
Fly
Fly
13.0 Hovers in place. Does not deal contact damage and is harmless, but can turn into PooterPooters if they stay around PoopPoop.
Attack Fly
Attack Fly
18.0 Red fly that follows Isaac and deals contact damage.
Eternal Fly
Eternal Fly
96.0 Invulnerable fly that circles Corny PoopCorny Poop and various monsters. Deals contact damage. Turns into a vulnerable Attack FlyAttack Fly after the object or monster it circles is destroyed.
Pooter
Pooter
14.0 Slowly drifts toward Isaac, occasionally firing a single blood shot at him. Does not deal contact damage.
Super Pooter
Super Pooter
14.1 Slowly drifts toward Isaac, occasionally firing two blood shots in a V-formation at him. Does not deal contact damage.
Full Fly
Full Fly
249.0 Flies toward Isaac erratically, dealing contact damage. Releases 6 bullets in all directions upon death.
Boom Fly
Boom Fly
25.0 Flies across the room in straight diagonal lines, dealing contact damage. Explodes upon death.
Red Boom Fly
Red Boom Fly
25.1 Flies across the room in straight diagonal lines, dealing contact damage. Creates a ring of 6 blood shots upon death.
Sucker
Sucker
61.0 Flies slowly towards Isaac, exploding into 4 shots in the cardinal directions upon death.
Spit
Spit
61.1 Flies slowly towards Isaac, firing an Collectible Ipecac iconIpecac shot towards Isaac upon death.
Gurgle
Gurgle
87.0 Walks towards Isaac, dealing contact damage and periodically firing Collectible Ipecac iconIpecac shots at him; they are immune to this explosion, but other enemies are not. Can turn into a SplasherSplasher upon death.
Rotty
Rotty
226.1 Slowly walks towards Isaac, leaving short-lasting Red Creep behind itself. Spawns a BonyBony or two Attack FlyAttack Flies upon death.
Nulls
Nulls
252.0 Walks towards Isaac, dealing contact damage. Upon getting near Isaac, it will open its eyes, though its speed doesn't change. Fades into and out of visibility.
Globin
Globin
24.0 Chases Isaac, dealing a full heart of contact damage. Upon taking enough damage, it collapses into a pile of goo, which can be killed. Will regenerate after a short period of time if not killed quickly.
Gazing Globin
Gazing Globin
24.1 Quickly chases Isaac, dealing a full heart of contact damage. Upon taking enough damage, it collapses into a pile of goo, which will slide away from Isaac and can be killed. Will regenerate after a short period of time if not killed quickly.
Guts
Guts
40.0 Attaches itself to a wall or obstacle and rolls around it.
Mama Guts
Mama Guts
57.1 Slowly moves around the room, occasionally hopping and firing 8 large blood shots in all directions. Splits into 2 GutsGuts upon death.
Grub
Grub
239.0 Erratically moves around the room like Boss Larry Jr. ingameLarry Jr. and charges at Isaac when he gets within its line of sight. Spawns MaggotMaggots, ChargerChargers, or SpittySpitties upon death, one for each of its segments.
Gurgling
Gurgling
237.0 Charges towards Isaac when he lines up with them, leaving a trail of Red Creep and shooting 6 blood shots.
Keeper
Keeper
86.0 Hops around the room, firing 2 blood shots in a V formation at Isaac. Upon damaging Isaac, Isaac drops 2 coins on the ground but loses 3.
Hanger
Hanger
90.0 Floats around the room, firing 3 spread blood shots at Isaac. Upon damaging Isaac, Isaac drops 2 coins on the ground but loses 3. Spawns with an Eternal FlyEternal Fly circling around it.
Flaming Hopper
Flaming Hopper
54.0 Quickly hops around the room, doing contact damage. Covers a larger distance than the regular Hopper.
Leaper
Leaper
34.0 Hops around the room, doing contact damage. Occasionally jumps high into the air, dropping down onto Isaac's position while firing 4 blood shots in the cardinal directions.
Psychic Horf
Psychic Horf
248.0 Stationary enemy that fires a homing shot at Isaac when he gets in range of them.
Host
Host
27.0 Stationary enemy that is normally invulnerable. Raises its head up when Isaac gets close, revealing a fleshy stem that can be damaged. Upon raising its head, it will fire 3 blood shots in a spread and lower its head again.
Red Host
Red Host
27.1 Stationary enemy that can be damaged even when its head is lowered. Fire 5 spread blood shots when it raises its head.
Mobile Host
Mobile Host
204.0 Acts like the Host, but follows Isaac and deals contact damage.
Flesh Mobile Host
Flesh Mobile Host
247.0 Acts like the Red Host, but follows Isaac and deals contact damage.
Kamikaze Leech
Kamikaze Leech
55.1 Quickly charges towards Isaac when he gets in its line of sight. Explodes upon death.
Knight
Knight
41.0 Moves erratically around the room and charges towards Isaac when in line of sight. Can only be damaged from behind.
Floating Knight
Floating Knight
254.0 Behaves like the Knight but slower, and can fly over all obstacles.
Maw
Maw
26.0 Slowly floats towards Isaac, firing a blood shot at him when he is in their range.
Psychic Maw
Psychic Maw
26.2 Slowly floats towards Isaac, firing homing shots at him when he is in their range. Spawns with an Eternal Fly orbiting around it.
Mask + Heart
Mask + Heart
93.0 The Mask is invulnerable and moves around erratically, charging at Isaac when he lines up with it. The Heart avoids Isaac and fires 4 blood shots in the cardinal directions when Isaac gets near. Killing the Heart will automatically kill the Mask.
Mr. Maw
Mr
35.0 Walks towards Isaac and attacks by launching its head towards him. Turns into a MawMaw or GusherGusher upon death depending on the killed body segment. Occasionally separates at will.
Mom's Hand
Mom's Hand
213.0 Falls from the ceiling. If it lands on Isaac, it deals damage and teleports him back to the spawn room of the floor. Entering a room containing Mom's Hand will warn Isaac with Mom's laugh.
Hive
Hive
22.0 Wanders around the room, avoiding Isaac and spawning Attack FlyAttack Flies if he gets close. Spawns a large number of flies on death, which can be FlyFlies, Attack FlyAttack Flies, and/or PooterPooters.
Nest
Nest
205.0 Wanders around the room, avoiding Isaac and spawning SpiderSpiders if he gets close. Spawns a Big SpiderBig Spider or TriteTrite upon death.
Nerve Ending
Nerve Ending
231.0 Static enemy which acts as a meat shield.
Night Crawler
Night Crawler
255.0 Pops out of the ground in random locations and fires four short-range shots that spiral outwards if Isaac is in sight.
One Tooth
One Tooth
234.0 Follows Isaac and periodically dashes towards him when it gets close. Deals contact damage.
Spider
Spider
85.0 Erratically moves around the room. If Isaac gets close to it, it chases him, trying to deal contact damage.
Big Spider
Big Spider
94.0 Erratically moves around the room. If Isaac gets close to it, it chases him, trying to deal contact damage. Spawns two Spiders upon death.
Ticking Spider
Ticking Spider
250.0 Crawls around the room erratically, following Isaac and dealing contact damage. Can jump small distances. Explodes upon death.
Trite
Trite
29.1 Quickly leaps towards Isaac and deals contact damage.
Ragling
Ragling
246.0 Quickly leaps towards Isaac and deals contact damage. Randomly shoots two purple shots that orbit around it.
Baby Long Legs
Baby Long Legs
206.0 Runs away from Isaac and frequently spawns Spiders.
Wall Creep
Wall Creep
240.0 Crawls along walls to try to line up with Isaac and shoots three blood shots in a line.
Blind Creep
Blind Creep
242.0 Randomly crawls along walls and shoots three spread blood shots.
Rage Creep
Rage Creep
241.0 Slowly crawls along walls to try to line up with Isaac and shoots a Brimstone laser.
Splasher
Splasher
238.0 Walks aimlessly around the room, firing Ipecac shots in random directions.
Swarmer
Swarmer
91.0 Slowly floats around the room, spawning several Attack FlyAttack Flies. Spawns PooterPooters upon taking damage. Spawns a Boom FlyBoom Fly upon death.
Tumor
Tumor
229.0 Moves around the room diagonally, occasionally firing 6 blood shots in all directions. Fires more often upon getting damaged.
Psy Tumor
Psy Tumor
253.0 Moves around the room diagonally, occasionally firing 6 homing shots in all directions. Fires more often upon getting damaged.
Vis
Vis
39.0 Randomly wanders around the room. Pauses to charge and fire a Brimstone laser when Isaac gets in its line of sight.
Double Vis
Double Vis
39.1 Randomly wanders around the room. Pauses to charge and fire a Brimstone laser which fires from both sides when Isaac gets in its line of sight.
Chubber
Chubber
39.2 Randomly wanders around the room. Pauses to fire a Charger that deals one heart of damage when Isaac gets in its line of sight. The Charger is invulnerable, blocks Isaac's tears, has limited range, and flies back to the Chubber.
Wizoob
Wizoob
219.0 Disappears, then appears near Isaac and spits a cluster of spectral tears at him.
Lil' Haunt
Lil' Haunt
260.0 Floats toward Isaac and occasionally fires a blood shot at him, predicting his movements.
Poky
Poky
44.0 Slides around the room aimlessly, damaging Isaac by contact. Disappears when the room is cleared.
Slide
Slide
44.1 Quickly slides towards Isaac when he gets in its line of sight, then moves slowly back to its original position. Cannot be destroyed.
Wall Hugger
Wall Hugger
218.0 Moves around the room like Guts, damaging Isaac by contact. Cannot be destroyed.
Stone Grimace
Stone Grimace
42.0 Stationary and invulnerable monster that occasionally fires a blood shot at Isaac. Stops firing when room is cleared.
Vomit Grimace
Vomit Grimace
42.1 Stationary and invulnerable monster that occasionally fires an Ipecac shot at Isaac. Stops firing when room is cleared.
Constant Stone Shooter
Constant Stone Shooter
202.0 Stationary and invulnerable monster that continuously fires shots in a single direction.
Gaping Maw
Gaping Maw
235.0 Stationary and invulnerable monster that sucks Isaac towards it, along with Isaac's tears and enemy projectiles.
Blue Boil
Blue Boil
(except in Rebirth)
298.0 Stationary enemy that decreases in size when hit, but regenerates to its full size until fully destroyed. Fires 1-3 blood shots towards Isaac when fully swollen.
Dank Death's Head
Dank Death's Head
(except in Rebirth)
212.1 Moves diagonally around the room, dealing contact damage. Needs to be killed to complete the room.
Mega Clotty
Mega Clotty
(except in Rebirth)
282.0 Slowly moves around the room, occasionally hopping and either firing 6 blood shots in all directions, leaving a puddle of Red Creep, or spawning a ClottyClotty or a collapsed GlobinGlobin. Splits into two ClottyClotties upon death.
Corn Mine
Corn Mine
(except in Rebirth)
295.0 Goes off when destroyed or after some time, then releases a cloud of poisonous gas and fires corny shots in eight directions.
Flaming Fatty
Flaming Fatty
(except in Rebirth)
208.2 Slowly walks towards Isaac. Occasionally farts, which pushes Isaac and adjacent enemies away (in Repentance) and spawns a damaging flame. Has a chance to leave behind a damaging flame upon death.
Conjoined Fatty
Conjoined Fatty
(except in Rebirth)
257.0 Slowly walks towards Isaac. Occasionally pauses to fart out a line of damaging Green Creep towards Isaac. Chance to turn into a regular Fatty upon death.
Hush Fly
Hush Fly
(except in Rebirth)
296.0 Gathers with other Hush Flies to form certain patterns. If spawned by Boss Hush ingameHush, can chase Isaac or orbit Hush. Deals contact damage.
Greed Gaper
Greed Gaper
(except in Rebirth)
299.0 Walks towards Isaac, dealing contact damage.
Blue Gaper
Blue Gaper
(except in Rebirth)
297.0 Walks towards Isaac, dealing contact damage.
Black Globin's Head
Black Globin's Head
(except in Rebirth)
279.0 Slides towards Isaac, leaving a trail of damaging Red Creep.
Black Globin's Body
Black Globin's Body
(except in Rebirth)
280.0 Walks aimlessly around the room, occasionally spawning spiders.
Black Bony
Black Bony
(except in Rebirth)
277.0 Wanders around the room and throws three bones in a row at Isaac when he is in sight. Explodes upon death.
Drowned Charger
Drowned Charger
(except in Rebirth)
23.1 Slowly moves around the room, charging at Isaac when he gets in its line of sight. Explodes into four blood shots in the ordinal directions upon death.
Drowned Boom Fly
Drowned Boom Fly
(except in Rebirth)
25.2 Flies across the room in straight diagonal lines, dealing contact damage. Upon death, explodes and fires four blood shots in the cardinal directions. Also has a chance to spawn a Drowned ChargerDrowned Charger upon death.
Dukie
Dukie
(except in Rebirth)
288.0 Flies around the room diagonally, occasionally spitting out 1-2 Dart FlyDart Flies.
Mom's Dead Hand
Mom's Dead Hand
(except in Rebirth)
287.0 Falls from the ceiling. Upon landing, it spawns several rock waves that travel outwards. Spawns several spiders upon death. Entering a room containing Mom's Dead Hand will warn Isaac with Mom's laugh.
Fat Bat
Fat Bat
(except in Rebirth)
258.0 Slowly flies towards Isaac. Tries to align itself diagonally to Isaac and shoots at him when in that alignment.
Blister
Blister
(in Afterbirth † and Repentance)
303.0 Slowly hops towards Isaac, occasionally spawning a Dark Ball. Spawns a SackSack upon death.
Poison Mind
Poison Mind
(in Afterbirth † and Repentance)
301.0 Slowly (except in Repentance)crawls/(in Repentance)floats around the room diagonally, leaving a trail of damaging green creep. (in Repentance) Explodes upon death.
Mr. Red Maw
Mr
(in Afterbirth † and Repentance)
35.2 Walks towards Isaac and attacks by launching its head towards him. Turns into a Red MawRed Maw or Gusher upon death depending on the killed body segment. Occasionally separates at will.
The Thing
The Thing
(in Afterbirth † and Repentance)
304.0 Crawls along a wall and attempts to line up with Isaac, then spits a line of damaging Red Creep.
Stoney
Stoney
(in Afterbirth † and Repentance)
302.0 Chases Isaac and blocks tears, but does not deal contact damage. Temporarily pauses in exhaustion after a certain amount of time. Invulnerable; dies when the room is cleared.
Cross Stone Shooter
Cross Stone Shooter
(in Afterbirth † and Repentance)
202.10 Stationary and invulnerable monster that continuously fires shots in four directions, alternating between cardinal and ordinal.
Portal
Portal
(in Afterbirth †)
306.0 Spawns various enemies from the current floor until it either vanishes or is killed.
Swarm Spider
Swarm Spider
(in Repentance)
884.0 Very erratically hops toward Isaac in large groups, dealing contact damage.
Migraine
Migraine
(in Repentance)
869.0 Crawls around the room erratically, following Isaac and dealing contact damage. Can jump small distances. Releases multiple Troll BombTroll Bombs upon death.
Eggy
Eggy
(in Repentance)
29.2 Hops aimlessly around the room, spawning slowing white creep wherever it hops. Spawns a group of Swarm SpiderSwarm Spiders upon death.
Triple Grimace
Triple Grimace
(in Repentance)
42.2 Stationary and invulnerable monster that occasionally fires a triple shot at Isaac. Stops firing when room is cleared.

Degraded Bosses:

Name ID Notes
Blastocyst
Blastocyst
74.0 Small-form only
Chub
Chub
28.0
Dingle
Dingle
261.0
The Duke of Flies
The Duke of Flies
67.0
Fistula
Fistula
71.0 Medium-form only
The Haunt
The Haunt
260.0
Headless Horseman
Headless Horseman
82.0 Only the head
The Hollow
The Hollow
19.1
Larry Jr.
Larry Jr.
19.0
Mega Fatty
Mega Fatty
264.0
Monstro
Monstro
20.0
Pin
Pin
62.0
Polycephalus
Polycephalus
269.0
Super Greed
Super Greed
50.1
Teratoma
Teratoma
71.1 Small- and medium-form only
Widow
Widow
100.0

Bosses[ | ]

Boss The Adversary
Boss The Bloat
Boss Loki
Boss Mask of Infamy
The Adversary The Bloat Loki Mask of Infamy
Boss The Gate
Boss War
Boss The Fallen
Boss Headless Horseman
The Gate (except in Repentance) War Needs to be unlocked The Fallen Devil Room Icon Headless Horseman Needs to be unlocked
Boss Brownie
Boss Sisters Vis
Boss The Pile
Brownie (except in Rebirth) Needs to be unlocked Sisters Vis (in Afterbirth † and Repentance) Needs to be unlocked The Pile (in Repentance) Needs to be unlocked

Double Trouble[ | ]

Double Trouble Bosses
Boss Blighted Ovum
The Haunt
Boss The Husk
Boss Larry Jr.
(Double Trouble)
Blighted Ovum
(Double Trouble)
The Haunt
(Double Trouble)
The Husk
(Double Trouble)
Larry Jr.
Boss Dangle
Boss Little Horn
Boss Rag Man
(Double Trouble)
Dangle (except in Rebirth) Needs to be unlocked
(Double Trouble)
Little Horn (except in Rebirth) Needs to be unlocked
(Double Trouble)
Rag Man (except in Rebirth) Needs to be unlocked

Final Boss[ | ]

Mom will always appear on the second floor of this chapter or in the last boss room if Curse of the Labyrinth is active.

Boss Mom
Mom

Unlockable Achievements[ | ]

  • Dark Boy
    Dark Boy - Beat Chapter 3 without taking damage.

Trivia[ | ]

Music[ | ]

  • The music for Necropolis is titled When Blood Dries.[1]

References[ | ]


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