Binding of Isaac: Rebirth Wiki

Gapers walk towards Isaac by the most direct route possible. They will actively path around obstacles and other enemies that block their path to Isaac. Upon death, they will usually transform into a PacerPacer or with a slightly lower chance a GusherGusher.

Variations[ | ]

Frowning Gaper[ | ]

Frowning Gapers walk slowly toward Isaac (though faster than Gapers) and deal contact damage. They start out with their eyes closed, and when they have line of sight with Isaac, they will open their eyes and gain extra permanent speed. Upon death, they will usually transform into a PacerPacer or GusherGusher.

Flaming Gaper[ | ]

(except in Rebirth)

Flaming Gapers walk slowly toward Isaac (slightly faster than Gapers) and deal contact damage. Upon death, they will usually transform into a PacerPacer or GusherGusher.

Notes[ | ]

  • Unlike other flaming enemies, they are not immune to damage from fire sources and regular Gapers will not turn into Flaming Gapers upon contact with any source of fire.

Nulls[ | ]

Nulls walk slowly toward Isaac (similarly to Frowning Gapers) and deal contact damage. They start out with their eyes closed, and when they have line of sight with Isaac, they will open their eyes, though without a speed increase. They periodically fade into and out of visibility.

Notes[ | ]

  • White Champion Nulls may not be able to turn invisible while invincible.
  • They are referred to as "Nulls", which goes both for its singular and plural usage.
  • (except in Rebirth) The health bar that Collectible Spider Mod iconSpider Mod adds to enemies will not appear under a Nulls while it is invisible.

Cyclopia[ | ]

(except in Rebirth)

Cyclopias walk toward Isaac (slightly slower than Gapers), dealing contact damage and leaving behind a short-lasting trail of damaging Red Creep. Occasionally shoots a blood shot towards Isaac.

Gurgle[ | ]

Gurgles walk towards Isaac (significantly faster than Gapers), dealing contact damage and periodically firing Collectible Ipecac iconIpecac shots at him. These shots can kill other enemies caught in their blast radius, but Gurgles themselves are immune to their own shots as well as Ipecac shots, bombs, and (in Repentance) fireballs from other monsters. They can turn into a SplasherSplasher upon death.

Crackle[ | ]

(in Repentance)

Crackles walk towards Isaac at the same speed as a Gurgle, dealing contact damage and periodically shooting a fireball which releases 4 lines of fire in the cardinal directions when it touches the ground. These lines of fire span the length and height of a normal sized room. Like the Gurgle, they are immune to fireballs, Ipecac shots, and bombs from other monsters.

Blue Gaper[ | ]

(except in Rebirth)

Blue Gapers walk towards Isaac slightly faster than Gapers, and deal contact damage. They are mainly spawned by Boss Hush ingameHush.

Notes[ | ]

Greed Gaper[ | ]

(except in Rebirth)

Greed Gapers walk toward Isaac, dealing contact damage. They are mainly spawned during the Boss Ultra Greed ingameUltra Greed boss fight.

(in Repentance) If they deal contact damage to Isaac, they will force Isaac to drop or lose some coins, similar to KeeperKeepers.

Notes[ | ]

  • They have 4 different appearances, though this is purely cosmetic.
  • (in Afterbirth † and Repentance) 2 Greed Gapers may rarely replace the Shopkeeper in ShopShops.
  • (in Afterbirth †) 2-4 Greed Gapers have a chance to appear in Treasure RoomTreasure Rooms.
  • (in Repentance) Greed Gapers no longer appear in Treasure Rooms; layouts that used to contain them now contain BulbBulbs. They can, however, appear in Ultra Secret RoomUltra Secret Rooms.

Deep Gaper[ | ]

(in Repentance)

Deep Gapers are initially hidden and emerge from the floor once all initial enemies in the room have been killed. Deep Gapers walk towards Isaac slightly faster than Gapers after emerging and deal contact damage.

Notes[ | ]

  • This enemy has 14 design variants, 7 for DownpourDownpour and 7 for DrossDross. These variants are purely cosmetic with the exception of one that has a Small LeechSmall Leech stuck to its head, which will detach from it and chase Isaac when the Deep Gaper is killed.

Blurb[ | ]

(in Repentance)

Blurbs walk slowly towards Isaac, dealing contact damage. After taking some damage or getting close to Isaac, they fire a chaotic burst of tears at him and chases Isaac at the speed of Frowning Gapers, attempting to deal contact damage. They have a high chance to turn into PacerPacers or GusherGushers upon death.

They will still spit out their projectiles if killed in an instant with high damage, firing towards Isaac even if he is not within targeting range.

Wraith[ | ]

(in Repentance)

Wraiths walk towards Isaac slightly faster than Gapers, dealing contact damage. They are invisible and can only be seen through the reflection they cast in the water, or the ripples they make as they walk. The occasional lightning strikes in Downpour will also make them briefly visible.

Notes[ | ]

  • They are visible in the Mirrored World, but their reflections will be invisible instead, appearing when lightning strikes.
  • The occasional lightning strikes in DownpourDownpour will briefly render them visible.

Rotten Gaper[ | ]

(in Repentance)

Rotten Gapers chase Isaac but have different behaviors depending on their appearance, and each has a different subtype (10.3.x).

ID Image Specifications
10.3.1 Rotten Gaper Fairly high speed, same as a Frowning GaperFrowning Gaper.
10.3.2 Rotten Gaper 2 Significantly higher speed, slightly less than a Gazing GlobinGazing Globin.
10.3.3 Rotten Gaper 3 Moderate speed; spawns a Small MaggotSmall Maggot every 2 seconds, but no more than 6 at a time.
10.3.4 Rotten Gaper 4 Moderate speed, same as a GaperGaper.
10.3.5 Rotten Gaper 5 Moves similarly to LustLust, gradually gaining momentum, and moves very fast. Doesn't try to run into Isaac, instead tries to 'orbit' around him.

Dead Isaac[ | ]

(in Repentance)

Dead Isaacs are enemies exclusively spawned by Boss Mother secondphase ingameMother as part of one of her attacks. They are summoned from the bottom of the arena and will walk directly upward (ignoring Isaac completely), dealing contact damage. Once they reach Mother, she swipes at them, killing them, releasing a burst of blood shots, and launching their corpses towards Isaac. After a while, she ends this attack by slamming down both hands, which causes a small rock wave to appear beneath any remaining Dead Isaacs, launching them up into the air.

Notes[ | ]

  • Due to Dead Isaac only being encountered via one attack, it is possible to go multiple runs without finding them. They are required in order to complete the Bestiary.

Twitchy[ | ]

(in Repentance)

Twitchies are a Gaper/ TriteTrite hybrid that alternate between chasing Isaac and rapidly leaping at him, dealing contact damage. They leap at Isaac 1-3 times before returning to chasing him on foot, and their leaps can target him from almost across an entire normal-sized room. They can leap to Isaac's current position, or where Isaac is heading, and can also leap away to dodge incoming fire.

Level 2 Gaper[ | ]

(in Repentance)

Level 2 Gapers walk toward Isaac (faster than Gapers but slower than Frowning Gapers), dealing a full Heart of contact damage. They split into a Level 2 HorfLevel 2 Horf and Level 2 GusherLevel 2 Gusher upon death.

Gallery[ | ]

Trivia[ | ]

  • (except in Rebirth) When Collectible Head of the Keeper iconHead of the Keeper is picked up as Character Keeper iconKeeper, he will look similar to the Greed Gaper.
  • The appearance of Cyclopias is reminiscent of the fatal birth defect of the same name, which is characterized by the failure of the embryonic prosencephalon to properly divide the orbit of the eyes into two cavities.
  • (in Afterbirth †) A StoneyStoney makes the same sound as a Large Champion Gaper.
  • Frowning Gapers and Nulls don't make noises until they open their eyes.
  • (except in Rebirth) Greed Gapers are also known as Greedlings, a name given by a card of it from The Binding of Isaac: Four Souls, although it's seldom referred to as a "Greedling" by players.
  • Gapers have among the most variations of any 'family' of monster.
  • (in Repentance) Blurbs spawned outside of DownpourDownpour will be skin-toned.
  • (in Repentance) Wraiths spawned in rooms without water will appear translucent.
  • (in Repentance) Blurbs, Deep Gapers, Wraiths, Rotten Gapers, and Twitchies originate from the Antibirth mod. In Antibirth, Deep Gapers were referred to as Tidal Gapers.
  • (in Repentance) Despite being a hybrid with a Trite, Twitchies aren't affected by Collectible Bursting Sack iconBursting Sack due to being categorized as a Gaper variant.
  • (in Repentance) 34 Dead Isaacs are specifically spawned in Boss Mother secondphase ingameMother's attack, referencing the 34 playable characters, implying that they are all dead. This makes sense, as all characters really are Isaac himself, whom we see suffocating in a chest in Ending 20.
  • A Frowning Gaper figure can be seen in the screenshot for the starter house in Mewgenics an upcoming game from Edmund McMillen.

Bugs[ | ]

Bug Bug! If a Dark-Red champion Frowning Gaper does not become a PacerPacer or GusherGusher and regenerates, the head won't appear until it sees Isaac. The same goes for a Gaper, however the head won't appear at all.
Bug Bug! (in Afterbirth and Afterbirth †) If an Collectible Explosivo iconExplosivo tear is stuck to a Nulls when it becomes invisible, the tear will fall to the ground.
Bug Bug! (in Repentance) The Collectible Explosivo iconExplosivo tear will instakill a Nulls when it becomes invisible.
Bug Bug! (in Rebirth and Afterbirth) If a Champion Gaper is killed and it turns into a PacerPacer or GusherGusher, it will no longer be a champion.