"...watching through a crack in his door..." This article is currently under heavy maintenance and construction. It will be completed soon. |
Monsters are enemies that Isaac regularly encounters throughout the Floors in The Binding of Isaac: Rebirth.
Relevance[]
Monsters pose as both threats and obstacles to Isaac, as they can attack Isaac, dealing damage, and, when they are present in a room, all of the doors will close, preventing Isaac from leaving the room, unless Isaac destroys a door with a Bomb.
Champions[]
Monsters have a random chance to spawn as a Champion. When Bosses are champions, different effects are added to the monsters, such as exploding on death, and different colors are applied to the Monsters as well.
Classic Monsters[]
Below is a list of all classic Monsters found within The Binding of Isaac: Rebirth.
No Bosses that spawn as monsters are listed.
Monster | Image | Behavior |
Angelic Baby | Shoots three tears in a tri-pattern at Isaac when in its range. Can occasionally teleport. Deals contact damage. | |
Attack Fly | Flies towards Isaac. Deals contact damage. | |
B. Licker | Acts exactly like a Larry Jr. segment, attaching themselves to each other and detaching on death. | |
Baby | Shoots one tear at Isaac when in its range. Can occasionally teleport. Deals contact damage. | |
Big Spider | Moves like Spider, dashing around randomly and at Isaac if they are in range. When killed, spawns two Spiders. Deals contact damage. | |
Black Fly | Ignores Isaac, flying randomly around the room. Does not deal contact damage. Can turn into a Pooter if near Poop. | |
Bloodshot Eye | Iris constantly views Isaac. If the iris directly views Isaac, it will shoot a brimstone laser at Isaac. Deals contact damage. | |
Boil | Its size represents how close it is to firing and how much health it has. Shrinks when damaged. When full size, it shoots a barrage of bullets in random directions. Stationary. Does not deal contact damage. | |
Boom Fly | Flies in a diagonal direction, bouncing off of the walls. When killed, explodes. Deals contact damage. Tip: Does less contact damage than explosive damage. | |
Brain | Moves randomly around the room until Isaac is in view distance, it then proceeding toward Isaac. Leaves a trail of Creep behind it that does not harm other Brains. Deals contact damage. | |
Charger | Moves randomly around the room until Isaac is in cardinal directions, it then proceeding to charge toward Isaac. Deals contact damage. | |
Clot | Moves randomly around the room, occasionally shooting tears in an "X" pattern. Deals contact damage. | |
Clotty | Moves randomly around the room, occasionally shooting tears in a plus pattern. Deals contact damage. | |
Dople | Mirrors Isaac's movement. Shoots when Isaac shoots, just in the opposite direction. Deals contact damage. Tip: Can be killed by spikes. | |
Double Vis | Randomly walks around the room until Isaac enters one of its cardinal directions, in which it will charge and fire two brimstone shots, one away from Isaac and one towards Isaac. Deals contact damage. | |
Embryo | Randomly hops around the room, ignoring Isaac. Deals contact damage. | |
Eternal Fly | Flies around its host (Blue Baby (Boss), Corny Poop, Hangers, and Holy Leeches). Invincible until the death of its host. Deals contact damage. | |
Evil Twin | Mirrors the player's movement. Shoots three tears in a tri-pattern when the player shoots, just in the opposite direction. Cannot be killed from spikes. Deals contact damage. | |
Eye | Iris looks at Isaac. If iris looks directly at Isaac, it will shoot a Technology laser at Isaac. Deals contact damage. | |
Fat Fly | Randomly and very slowly flies around the room. Will shoot two tears at Isaac in a "V" pattern if close enough. Deals contact damage. | |
Flaming Hopper | Hops around the room quickly and randomly unless Isaac is in its vicinity, in which it will hop towards Isaac. Can hop over holes, spikes, and rocks. Deals contact damage. | |
Fred | Occasionally leaps into the air, diving into the ground, shooting tears in an "X" pattern on impact. Occasionally shoots an explosive tear at the player. Deals contact damage. | |
Frowning Gaper | Stationary until it has a path to move towards the player. Can turn into a Pacer or Gusher on death. Deals contact damage. | |
Gaper | Stationary until it has a path to move towards the player. Can turn into a Pacer or Gusher on death. Deals contact damage. | |
Gazing Globin | Quickly moves towards the player. When killed, it turns into a pile of mush that moves away from the player. It must be killed again, or it will regenerate with noticeably less health than normal. Deals contact damage. | |
Globin | Slowly moves towards the player. When killed, it turns into a pile of mush. It must be killed again, or it will regenerate with noticeably less health than normal. Deals contact damage. | |
Gurgler | Slowly moves towards the player, occasionally shooting explosive tears at the player. It cannot damage itself or other Gurglers. Deals contact damage. | |
Gusher | Randomly walks around the room, occasionally shooting a tear in a random direction. Deals contact damage. | |
Gut | Its size represents how close it is to firing and its health. Shrinks when damaged. When full size, shoots an explosive tear at the player, possibly damaging itself or other monsters. Stationary. Does not deal contact damage. | |
Guts | Moves along rocks, holes, and other obstacles in one direction and pattern. When one of the obstacles it is circling is destroyed, it will pick a new path. Deals contact damage. | |
Hanger | Floats towards the player on a rope, occasionally shooting three tears at the player in a tri-pattern. Has an eternal fly rotating around it. Deals contact damage. | |
Hive | Walks away from the player, occasionally coughing out Attack Flies. Spawn Flies on death. Does not deal contact damage. | |
Holy Leech | Randomly floats around the room until the player is in its cardinal directions, in which it charges at the player. Has an eternal fly rotating around it, though this dies with the Holy Leech. Holy Leech explodes on death. Can't fly over rocks, but can fly over spikes and holes. Deals contact damage. | |
Hopper | Randomly hops around the room, unless the player is nearby, in which it will hop towards the player. Can hop over rocks, holes, and spikes. Deals contact damage. | |
Horf | Shoots a tear at the player when the player is near it. Stationary. Deals contact damage. | |
Host | Is invincible until the skull is raised, exposing its vulnerable organs. When the skull is raised, it shoots tears in a tri-pattern at the player. Will only raise its skull when not damaged for long enough. If receiving too much damage, the skull will become crushed, grinning at the player. Does not deal contact damage. Bombs are ineffective against it when its skull is down. | |
I. Blob | Randomly hops around the room, occasionally firing tears in an asterisk pattern. Deals contact damage. | |
Kamikaze Leech | Randomly floats around the room until the player is in its cardinal directions, in which it will charge at the player. Can fly over spikes, rocks, and holes. Explodes on death. Deals contact damage. | |
Keeper | Randomly hops around the room until the player is near, in which it shoots tears in a tri-pattern at the player and hops towards the player. Can hop over rocks, spikes, and holes. | |
Knight | Randomly walks around the room until the player is either in front of it or beside it, in which it charges at the player. It is invulnerable if attacked at the front or sides, but it takes damage when its vulnerable, exposed brain, located on the back of the head, is attacked. Deals contact damage. | |
Leaper | Randomly hops around the room until the player is near it, in which it hops towards the player. Will occasionally leap high in the air toward the player, going off-screen, and, when landing, will shoot tears in a plus pattern. Can hop and leap over spikes, rocks, and holes. Deals contact damage. | |
Leech | Randomly floats around the room until the player is in its cardinal directions, in which it charges towards the player. Can float over spikes, rocks, and holes. Deals contact damage. | |
Lump | Fires three tears in a tri-pattern at the player, then burrows underground, only to emerge elsewhere. Deals contact damage. | |
Maggot | Randomly crawls around the room, ignoring the player. Deals contact damage. | |
Mama Guts | Randomly slides around the room, occasionally hopping into the air, shooting tears in an asterisk pattern upon landing. Spawns two Guts on death. Deals contact damage. | |
Mask + Heart | Heart randomly moves around the room, occasionally, when the player enters its cardinal directions, shooting tears in a plus pattern. Mask randomly moves around the room until the player enters its cardinal directions, in which it charges at the player. Mask is invulnerable until Heart dies, in which it will die. Both Mask and Heart deal contact damage. | |
Maw | Flies over rocks, holes, and spikes towards the player and, when in range, shoots a single tear at the player. | |
MemBrain | Randomly slides around the room, leaving a trail of creep behind it and occasionally hopping into the air, shooting tears in an asterisk pattern upon landing. Spawns two Brains on death. Deals contact damage. | |
Moter | Flies towards the player. When killed, splits into two Attack Flies. Deals contact damage. | |
Mr. Maw | Walks towards the player. When the player is in range, it will launch it's head at the player, When killed, it spawns either a Pacer or a Maw. Both head and body deal contact damage. | |
Mulliboom | Walks towards the player. When close to the player or when killed, it explodes. Does not get close enough to deal contact damage. Unlike all other explosive damage, this particular explosion only deals a half heart of damage. | |
Mulligan | Walks away from the player. On death, spawns multiple flies. Will sometimes explode voluntarily. Does not deal contact damage. | |
Mulligoon | Walks away from the player. On death, spawns a Troll Bomb. Does not deal contact damage. | |
Pacer | Randomly walks around the room, ignoring the player. Deals contact damage. | |
Parabite | Moves towards the player, occasionally burrowing underground only to later emerge from the ground elsewhere. Deals contact damage. | |
Poky | Randomly moves around the room, not disappearing until every enemy in the room has died. Deals contact damage. | |
Pooter | Randomly and flies around the room quite slowly. Will shoot a single tear at the player if close enough. | |
Psychic Maw | Floats towards the player and, when in range, shoots a homing tear at the player. Deals contact damage. | |
Red Boom Fly | Flies diagonally around the room, bouncing off of walls. When killed, it shoots tears in an asterisk pattern. Deals contact damage. | |
Red Host | Stationary. When the player is in range, its skull raises, allowing it to shoot five tears at the player in a wave pattern. Deals contact damage. | |
Red Maw | Floats towards the player. When killed, it shoots tears in a plus pattern. Deals contact damage. | |
Sack | Its size represents how close it is to spawning a spider and its health. Shrinks when damaged. When full size, spawns a single Spider. Stationary. Does not deal contact damage. | |
Selfless Knight | Randomly walks around the room until the player is either in front of it or beside it, in which it charges at the player. It is invulnerable if attacked at the front or sides, but it takes damage when its vulnerable, fleshy face, located on the back of the head, is attacked. Deals contact damage. | |
Slide | Remains stationary until the player enters its cardinal directions, in which it has a chance to charge at the player, sliding back afterwards. Deals contact damage. | |
Spider | Randomly dashes around the room in short bursts until it is near the player, in which it will dash towards the player. Deals contact damage. Warning: Can dash between two rocks. | |
Spit | Flies slowly towards the player. When killed, shoots an explosive tear at the player. Deals contact damage. | |
Spitty | Randomly moves around the room, occasionally shooting a single tear in the direction it is facing. Deals contact damage. | |
Splasher | Randomly moves around the room, occasionally firing an explosive tear in a random direction, monsters being immune to said explosion. Deals contact damage. | |
Stone Grimace | Stationary. When in range, it will shoot a single tear at the player. Invincible, but it is disabled after all monsters in the same room are defeated. Does not deal contact damage. | |
Sucker | Flies slowly towards the player. When killed, shoots four tears in a plus pattern. Deals contact damage. | |
Swarmer | Flies slowly around the room, spawning Flies as it takes damage and occasionally spawning either a Pooter or a Fat Fly. Upon death, spawns either a Boom Fly or a Red Boom Fly. Deals contact damage. | |
Trite | Randomly hops around the room until near the player, in which it hops towards the player. Can hop over spikes, holes, and rocks. Deals contact damage. | |
Vis | Randomly walks around the room until the player enters one of its cardinal directions, in which it will, after charging, fire a brimstone laser at the player. Deals contact damage. | |
Vomit Grimace | Stationary. When in range, it will shoot a single explosive tear at the player. Invincible, but it is disabled after all monsters in the same room are defeated. Does not deal contact damage. | |
Walking Boil | Randomly walks around the room, occasionally firing a barrage of tears in the player's direction. Deals contact damage. | |
Walking Gut | Randomly walks around the room, occasionally firing an explosive tear, in which it is immune to, in a random direction. Deals contact damage. | |
Walking Sack | Randomly walks around the room, occasionally spawning a Spider. Deals contact damage. |
Rebirth[]
Below is a list of all Rebirth Monsters found within The Binding of Isaac: Rebirth.
No Bosses that spawn as monsters are listed.
Monster | Image | Behavior |
Baby Long Legs | Quickly and erratically crawls away from the player, occasionally spawning a Spider. Deals contact damage. | |
Begotten | Moves toward the player, only to be stopped by a chain tied to the wall. When the chain is broken either over time or by the player, Begotten sprints at the player, darkening the room. Phases in and out of visibility. Deals contact damage. | |
Black Maw | Randomly floats around the room. When the player is horizontally aligned with it, it charges towards the player. Ocasionally spawns Kamikaze Leeches. Explodes on death. Deals contact damage. | |
Blind Creep | Randomly crawls along the wall, occasionally stopping and shooting three tears in a tri-pattern. Deals contact damage. | |
Blubber | Randomly strolls around the room, ignoring the player. Will occasionally shoot a small yet high-ranged barrage of tears randomly. Can turn into a Half Sack on death. Deals contact damage. | |
Brimstone Grimace | Immobile. Invincible. Shoots Brimstone lasers at the player. Deactivates when all enemies in the room are killed. | |
Camillo Jr. | Diagonally moves around the room, occasionally firing a technology laser at the player. Tends to fire more after taking damage. Deals contact damage. | |
Codworm | Stationary. Invincible until the worm exposes itself. After taking damage when invincible, shoots a barrage of tears at the player. | |
Conjoined Spitty | Randomly moves around the room, occasionally shooting a single tear from both its heads. Deals contact damage. | |
Crazy Long Legs | Erratically crawls towards the player, occasionally stopping to shoot eight tears outward. Deals contact damage. | |
Death's Head | Flies diagonally around the room, bouncing off of walls. Can fly over Rocks, Spikes, Holes, and other obstacles. Is invulnerable, only dying when all other enemies in the room are killed. Deals contact damage. | |
Dinga | Randomly and slowly slides around the room, occasionally spawning dips and stomping. Upon stomping, will shoot tears in an asterisk patter. Spawns two Squirts on death. Deals contact damage. | |
Dip | Randomly darts short distances around the room. When near the player, will dart towards the player. Deals contact damage. | |
Fat Sack | Slowly strolls towards the player, leaving a trail of creep behind. Occasionally leaps towards the player's position, shoot six tears in an asterisk pattern on impact. May spawn a Blubber or Half Sack on death. Deals contact damage. | |
Fatty | Slowly strolls towards the player, occasionally releasing gas, letting out a large, brown cloud of gas with powerful knockback. Deals contact damage. | |
Floating Knight | Randomly moves around the room. When the player is either beside or in front of it, it will charge at them. Is invulnerable from front, but can be damaged from the back. Can fly over Holes, Spikes, and Cobwebs. Deals contact damage. | |
Full Fly | Erratically flies towards the player. When killed, shoots tears in an asterisk pattern. Can fly over Spikes, Rocks, Holes, and other obstacles. Deals contact damage. | |
Gaping Maw | Immobile. Invincible. Constantly pulls the player, tears, enemies, and items towards it. | |
Grub | Randomly moves around the room. When the player is either beside or in front of it, charges at the player. On death, spawns Maggots, Spitties, and Chargers. Deals contact damage. | |
Half Sack | Randomly strolls around the room, ignoring the player and leaving a trail of red creep behind it. Deals contact damage. | |
Homunculus | Moves toward the player, only to be stopped by a cord tied to the wall. When the chord is broken either over time or by the player, the cord shoots six tears in an asterisk pattern and Homunculus sprints at the player. On death, leaves a puddle of creep. Deals contact damage. | |
Level 2 Fly | Erratically flies towards the player. Can fly over Spikes, Rocks, Holes, and other obstacles. Deals contact damage. | |
Level 2 Spider | Erratically dashes around the room, occasionally hopping very short distances. When in range, will dash towards the player. Can hop over Spikes, Rocks, Holes, and other obstacles. Deals contact damage. | |
Mom's Hand | Falls from above onto the player. If it hits the player, it will deal contact damage and teleport the player to the start of the floor. | |
Nerve Ending | Immobile. Deals contact damage. | |
Nest | Walks away from the player, occasionally coughing up a spider. On death, spawns a Trite. | |
Nightcrawler | Burrows into the ground, only to resurface elsewhere. After resurfacing, will fire four orbiting tears. Deals contact damage. | |
Null | Immobile until the player is in range, in which it charges towards the player. Phases in and out of visibility. Deals contact damage. | |
One Tooth | Flies towards the player, occasionally dashing towards the player. Can fly over Spikes, Rocks, Holes, and other obstacles. Deals contact damage. | |
Oob | Randomly floats around the room, occasionally spawning two Brains. When the player is horizontally aligned with it, charges across the room towards the player. Deals contact damage. | |
Pale Fatty | Slowly strolls towards the player, occasionally expelling gas, shooting six tears in an asterisk pattern. May spawn either a Blubber or Half Sack on death. Deals contact damage. | |
Psy Tumor | Floats diagonally around the room, bouncing off of walls and occasionally firing six homing tears in an asterisk pattern. Tends to shoot more after taking damage. Deals contact damage. | |
Rage Creep | Crawls along the wall, attempting to align itself with the player.Occasionally, or when aligned with the player, stops and fires a Brimstone laser at the player. Deals contact damage. Warning: The Brimstone laser lingers for about half a second after Rage Creep starts moving again. | |
Ragling | Randomly hops around the room. When in range, will hop towards the player. Occasionally, when in range, will shoot two orbiting tears. Deals contact damage. | |
Ring Fly | Flies towards the player while rotating in a circle of other Ring Flies. Can fly over Spikes, Rocks, Holes, and other obstacles. When no Ring Flies are left, flies towards the player in an erratic circle. Deals contact damage. | |
Rotty | Slowly walks towards the player, leaving a short trail of creep behind. When killed, has a chance to spawn either two Attack Flies or a Bony. Deals contact damage. | |
Round Worm | Burrows into the ground, only to resurface elsewhere. After resurfacing, will fire a single tear at the player if they are in range. Deals contact damage. | |
Skinny | Slowly walks towards the player, leaving a very short trail of creep behind. Deals contact damage. | |
Small Baby Long Legs | Quickly and erratically crawls away from the player, occasionally spawning a Sack. Deals contact damage. | |
Small Crazy Long Legs | Erratically crawls towards the player, occasionally stopping to shoot four tears in an "X" pattern. Deals contact damage. | |
Stone Eye | Immobile. Invincible. Rotates, constantly shooting a technology tear that damages the player and enemies. Disables after all enemies in the room are dead. | |
Squirt | Dashes long distances towards the player in separated bursts. Spawns two Dips on death. Deals contact damage. | |
Swinger | Slowly creeps towards the player, the head swinging around the mush. If the head is killed, a Globlin spawns. If the mush is killed, a Maw spawns. Deals contact damage. | |
Tickling Spider | Erratically darts around the room. When in range, will dart towards the player. On death, explodes. Deals contact damage. | |
Tiny Haunt | Invincible until in range of the player, in which it erratically flies towards the player, occasionally shooting a single tear at the player. Deals contact damage. | |
Tumor | Floats diagonally around the room, bouncing off of walls and occasionally firing six tears in an asterisk pattern. Tends to shoot more after taking damage. Deals contact damage. | |
Turret Grimace | Immobile. Invincible. Constantly shoots a single tear in one direction. | |
Walking Host | Walks towards the player. Invincible until it exposes its red tissue, in which it will shoot three tears in a tri-pattern at the player. Deals contact damage. | |
Walking Red Host | Walks towards the player. When exposing its weak spot, shoots five tears in a wave at the player. Deals contact damage. | |
Wall Creep | Crawls along the wall, attempting to align itself with the player. When aligned with the player, stops and consecutively shoots three tears in a straight line. Deals contact damage. | |
Wizoob | Fires a barrage of spectral tears at the player, disappearing afterwards, only to appear near the player later. Deals contact damage. |