Stone Grimace

42.0

A Stone Grimace is an invincible stationary statue with the shape of a head with a wide-open mouth and hollow eyes. Stone Grimaces will sporadically spit a Red bullet in Isaac's direction until the room is cleared by killing regular enemies, or by pressing Silver Buttons. When the room is cleared, the Stone Grimace closes its eyes and mouth.

Variations

Vomit Grimace

42.1
Chance to replace a normal Stone Grimace

The Vomit Grimace fires an explosive Ipecac-like shot. Like Stone Grimaces, Vomit Grimaces will stop firing at Isaac when the room is cleared.

Gaping Maw

235.0

The Gaping Maw sucks Isaac towards it, along with warping Isaac's and any enemies' bullet paths. It does not fire any shots and simply functions as an obstacle, and is often surrounded by spikes. They can, however, be deactivated by Silver Buttons.

Notes

• If a Gaping Maw is rerolled with D10, it will always turn into an Oob.

Broken Gaping Maw

236.0
Chance to replace regular Gaping Maws

A broken variant of the Gaping Maw. It alternates between active and inactive every four seconds, but it has a much stronger attraction power. Just like regular Gaping Maws, they can be deactivated by Silver Buttons.

Constant Stone Shooter

202.0

Constant Stone Shooters, sometimes referred to as Turret Grimaces, constantly fire bullets in a fixed direction, and do not stop firing even after the room is cleared. The exceptions are rooms with Silver Buttons, which deactivate them once they are all pressed.

Cross Stone Shooter

202.10

Cross Stone Shooters were added in Booster Pack #4.

The Cross Stone Shooter, sometimes referred to as Cross Grimace, constantly fires bullets in four directions, alternating between cardinal and diagonal directions. If the room has to be cleared, whether by killing enemies or by pressing Silver Buttons, then Cross Grimaces will deactivate upon the room's completion like a regular Grimace. However, if the room is purely trap based and does not present an objective to complete, then Cross Grimaces will continue shooting indefinitely.

Brimstone Head

203.0

Found only in Sheol, the Brimstone Head, sometimes referred to as Brimstone Grimace, periodically shoots Brimstone lasers and does not stop firing even after the room is cleared. The exception is pressing all Silver Buttons, which deactivates them.

Stone Eye

201.0

The Stone Eye resembles the Bloodshot Eye. It constantly rotates in a clockwise circle and shoots a flickering Technology laser. It stops firing after the room is cleared. Unlike any other Stone Grimace variants, the Stone Eye appears to despawn when the room is cleared, exited, and then re-entered.

Gallery

• 

  Sketches of monsters for the Binding of Isaac: Rebirth, including the Stone Eye in the first square of the first row, which was formerly called "360 Stole Laser;" the Constant Stone Shooter in the second square of the first row, which was called "Constant Stone Shot;" and the Brimstone Head in the third square of the first row (no visible sketch name).

Notes

• These monsters can be destroyed using Chaos Card, Little Horn and Euthanasia, though they will respawn upon leaving and re-entering the room they were in.
  • With Infestation 2, killing Stone Grimaces creates a Blue Spider, allowing blue spiders to be farmed by leaving and re-entering the room.
• Fire Mind tears that hit these monsters can still cause explosions.
• Hitting Grimaces increases the Dead Eye damage multiplier.
• Grimaces can appear in rooms with Silver Buttons, and will stop shooting once all buttons are pressed.
• If an uncleared room has Cross Grimaces, leaving and then re-entering the room by bombing a door will make them stop shooting, making the room easier.

Trivia

• Stone Grimaces and their variants play their appearance animation for a second before resuming as deactivated in a cleared room if they were deactivated.
  • They now no longer reuse their appear animation in a cleared room when the player re-enters it.
• If a Constant Stone Shooter is deactivated, it closes its eyes and mouth and stops crying, looking similar to Stone Grimaces upon deactivation. The difference is that deactivated Constant Stone Shooters still have a crack on top of their heads.
• If a Gaping Maw or Broken Gaping Maw is deactivated, unlike other Grimaces, it doesn’t fully close its eyes. Instead, it closes its eyes only partially and makes a frown.
• Previously, Broken Gaping Maws were extremely hard to find. As of Booster Pack #5, they are now more common to find in rooms.
• Grimaces will turn green if poisoned.