Binding of Isaac: Rebirth Wiki
Binding of Isaac: Rebirth Wiki
Disambig.png This article is about the enemy. For the item, see Lil Portal.

Added in Afterbirth †

Portals are enigmatic entities that appear Removed in Repentance on many floors/Added in Repentance only in The Void The Void. They continuously spawn enemies until they are destroyed or spawn a certain number of enemies.

Portals spawn different enemies depending on the floor they appear on.

List of possible spawns[]

Chapter 1[]

Entity ID Description
Frowning Gaper
Frowning Gaper
10.0 Walks towards Isaac, dealing contact damage. Upon getting near Isaac, it will open its eyes and pursue Isaac faster. Usually turns into a Pacer or a Gusher upon death.
Pooter
Pooter
14.0 Slowly drifts toward Isaac, occasionally firing a single blood shot at him. Does not deal contact damage.
Mulligan
Mulligan
16.0 Walks around the room, avoiding Isaac. Upon death, spawns several flies, which can be Black Flies, Attack Flies, and/or Pooters. Can suicide to explode and launch four projectiles in the cardinal directions while still releasing flies.
Attack Fly
Attack Fly
18.0 Red fly that follows Isaac and deals contact damage.
Hopper
Hopper
29.0 Slowly hops around the room, doing contact damage. Can turn into a Flaming Hopper by jumping into fire.
Spider
Spider
85.0 Erratically moves around the room. If Isaac gets close to it, it chases him, trying to deal contact damage.
Fatty
Fatty
208.0 Slowly walks towards Isaac. Occasionally farts, which pushes Isaac and adjacent enemies away.
Dip
Dip
217.0 Slowly dashes in random directions, dealing contact damage.
Round Worm
Round Worm
244.0 Pops out of the ground in random locations and spits a blood shot at Isaac if he is in sight.

Chapter 2[]

Entity ID Description
Charger
Charger
23.0 Slowly moves around the room, charging at Isaac when he gets in its line of sight.
Boom Fly
Boom Fly
25.0 Flies around the room diagonally, dealing contact damage. Explodes upon death.
Maw
Maw
26.0 Slowly floats towards Isaac, firing blood shots at him when he is in their range.
Sucker
Sucker
61.0 Flies slowly towards Isaac, exploding into 4 shots in the cardinal directions upon death.
Pale Fatty
Pale Fatty
208.2 Slowly walks towards Isaac. Occasionally farts and shoots 6 blood shots in all directions. Has a chance to turn into a Blubber or Half Sack upon death.
One Tooth
One Tooth
234.0 Follows Isaac and periodically dashes towards him when it gets close. Deals contact damage.
Fat Bat
Fat Bat
258.0 Slowly flies towards Isaac. Tries to align itself diagonally to Isaac and shoots at him when in that alignment.

Chapter 3[]

Entity ID Description
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.
Brain
Brain
32.0 Slowly crawls around the room, leaving a trail of Red Creep.
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.
Baby
Baby
38.0 Slowly floats towards Isaac and fires a blood shot at him. Occasionally teleports and reappears elsewhere.
Knight
Knight
41.0 Moves erratically around the room and charges towards Isaac when in line of sight. Can only be damaged from behind.
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 or Half Sack upon death.
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.
Bony
Bony
227.0 Wanders around the room and throws a bone at Isaac when he is in sight.
Tumor
Tumor
229.0 Moves around the room diagonally, occasionally firing 6 blood shots in all directions. Fires more often upon getting damaged.

Chapter 4[]

Entity ID Description
Clotty
Clotty
15.0 Randomly wanders around the room, firing 4 blood shots in the cardinal directions.
Brain
Brain
32.0 Slowly crawls around the room, leaving a trail of Red Creep.
Leech
Leech
55.0 Quickly charges towards Isaac when he gets in its line of sight.
Lump
Lump
56.0 Fires 3 spread blood shots at Isaac when he gets in its line of sight. Will burrow underground and reappear elsewhere after firing.
Para-Bite
Para-Bite
58.0 Moves towards Isaac, dealing contact damage. Can burrow underground and reappear elsewhere.
Fred
Fred
59.0 Hops out of the ground and burrows elsewhere, firing 4 blood shots in the ordinal directions. Occasionally fires red Ipecac shots at Isaac.
Mobile Host
Mobile Host
204.0 Acts like the Host, but follows Isaac and deals contact damage.

Chapter 5[]

Entity ID Description
Baby
Baby
38.0 Slowly floats towards Isaac and fires a blood shot at him. Occasionally teleports and reappears elsewhere.
Holy Leech
Holy Leech
55.2 Quickly charges towards Isaac when he gets in its line of sight. Explodes upon death. Spawns with an Eternal Fly circling it, which instantly dies when the Holy Leech explodes.
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 Fly circling around it.
Wizoob
Wizoob
219.0 Disappears, then appears near Isaac and spits a cluster of spectral tears at him.
Bony
Bony
227.0 Wanders around the room and throws a bone at Isaac when he is in sight.
Lil' Haunt
Lil' Haunt
260.0 Floats toward Isaac and occasionally fires a blood shot at him, predicting his movements.

Lil Portal[]

Added in Repentance

Lil Portals are entities that only appear in Mausoleum Mausoleum and Gehenna Gehenna. They continuously spawn fly and spider enemies until they are destroyed. There can be a max of 4 spawned monsters alive at once. Monsters they can spawn include:

Entity ID Description
Attack Fly
Attack Fly
18.0 Red fly that follows Isaac and deals contact damage.
Sucker
Sucker
61.0 Flies slowly towards Isaac, exploding into 4 shots in the cardinal directions upon death.
Ink
Ink
61.3 Flies slowly towards Isaac. Fires four tar shots in the ordinal directions and leaves a puddle of slowing black creep upon death.
Moter
Moter
80.0 Follows Isaac, similar to Attack Flies. Deals contact damage. Splits into 2 Attack Flies upon death.
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.
Small Crazy Long Legs
Small Crazy Long Legs
207.1 Chases Isaac, dealing touch damage. Occasionally stops to spit 4 blood shots in the diagonal directions.
Level 2 Fly
Level 2 Fly
214.0 Flies toward Isaac erratically, dealing contact damage.
Level 2 Spider
Level 2 Spider
215.0 Crawls around the room erratically, following Isaac and dealing contact damage. Can jump small distances.
Full Fly
Full Fly
249.0 Flies toward Isaac erratically, dealing contact damage. Releases 6 bullets in all directions upon death.
Swarm Spider
Swarm Spider
884.0 Very erratically hops toward Isaac in large groups, dealing contact damage.

Lil Portal (Flies Only)[]

There is a variant of the Lil Portal with the ID 306.1.1 that looks and behaves identically to regular Lil Portals but will only spawn Fly related monsters from its regular pool.

Entrance Portal[]

A special version of the Portal (dubbed the "Entrance Portal" to avoid confusion) serves as the entrance to The Void The Void. It is found in ??? ???, but can also be found after defeating Mom (5% chance and only if Isaac has 10+ tear damage or 20+ items), Mom's Heart/It Lives (10% chance), Isaac/Satan (15% chance), ???/The Lamb (20% chance), or Mega Satan (50% chance). The Entrance Portal room in ??? gets darker the closer the player is to the portal.

Unlockable Achievements[]

Notes[]

  • Charming a Portal with 15►Mom's Eyeshadow Mom's Eyeshadow or similar items will cause the Portal to spawn permanently charmed enemies similar to the 15►Friendly Ball Friendly Ball.
    • As a result, a permanently charmed Death's Head can spawn from charmed Portals on Chapter 3 and remain permanently invulnerable. This is the only known method of charming an invulnerable enemy.
  • If a portal is spawned in either Chest Chest or the Dark Room Dark Room via Debug Console, the Portal will despawn a few seconds before spawning any monster.
  • If Portals aren't unlocked, certain enemies will spawn in their rooms instead, depending on the floor the room is in. For instance, Frowning Gapers spawn as Portal placeholders on Chapter 1 floors, whereas Vises spawn as Portal placeholders on Chapter 4 floors.

Gallery[]

Trivia[]

  • Before v1.06.0185, portals continually spawned enemies until they were defeated.
  • Portals were able to spawn Bosses such as The Haunt on floors such as the Cathedral Cathedral. This was later removed.
  • As of Booster Pack #5, Portals will now leave a Purple "blood" splatter when killed by the player. This effect is only for aesthetic purposes. Formerly, they left the generic Red blood splatter.
  • Lil Portals resemble Warp Zones from Super Meat Boy.


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