Eraser

**Eraser** is an activated item added in *The Binding of Isaac: Repentance*.

## Effects

* On use, Isaac holds an Eraser above his head, which can be thrown in any cardinal direction. Upon hitting a monster, the monster will be "erased", preventing any of the same monster from appearing for the rest of the run.
	+ Deals 15 damage to bosses. If fatal, erases the boss for the rest of the run.
* Can only be recharged by entering a new floor. Batteries and most other methods of recharging have no effect.

## Notes

* Erased enemies and bosses appear as a brief pink puff of smoke. Any on-death effects are not checked.
	+ The Seven Deadly Sins minibosses and Angels will still drop their respective pickups or items.
	+ If used on multistage bosses like Hush or Ultra Greed, erasing the first phase skips any further phases.
* Has no effect on invincible enemies, such as Stone Grimaces, lowered Hosts, or Eternal Flys.
* Bulbs can steal charges from the Eraser.
* If Eraser's projectile hits an enemy's projectile that has collision with Isaac's tears and isn't considered an enemy (e.g. Fire Worm's fire, Coal Boy's coal, Big Bony's thrown bone) it has no effect and Eraser's projectile will be destroyed .
* Although the thrown Eraser cannot hit friendly enemies these enemies can still be erased if their hostile variants are erased. This also means that when effects such as  attempts to spawn an erased enemy it only creates the brief puff of pink smoke wasting the effect.
* Erased enemies will remain erased if a Victory Lap is started.
	+ Erased enemies will also remain erased if items such as  or  are used.
* Entities such as Ultra Greed Coins or Little Horn's Dark Balls are considered enemies and can be erased.
* It is possible to erase Chubber's launched Charger, rendering it unable to attack.
* Erasing Poltys will render Haunted Chests harmless, but may make some rooms impossible to complete without bombs or flight as they rely on a Polty clearing a path.
* Each floor traveled up during the Ascent will recharge the Eraser.
* If a boss earlier in the run is removed via Eraser, Delirium will disappear if it attempts to turn into that boss. This will spawn the ending chest and count as having defeated Delirium.

## Synergies

* : Can throw an additional Eraser.
* : Throwing the Eraser through the Angelic Prism will cause it to split into four.
* : The eraser can gain an extra charge if it is not used on one floor.
* Bethany /  Tainted Bethany: Soul and blood charges can be used with the Eraser, allowing multiple uses per floor.
* : Throwing the Eraser at an enraged Blood Puppy (second stage) will 'erase' its enraged form, keeping it permanently tame.
	+ Throwing the Eraser at its third stage will make it cycle through its normal and second stage as it kills enemies.
* : Spawns a pink eraser wisp on the middle ring. The wisp is immune to projectiles. If a non-boss enemy touches the wisp, it is erased and the wisp is destroyed. The wisp cannot erase bosses, regardless of how much health they have left.
* : An eraser can be thrown with each use of Void after absorbing it, allowing multiple uses per floor.
* Tainted Lazarus: Enemies erased in one form will still be erased when Tainted Lazarus flips.

## Interactions

* / : Item doesn't fully charge the Eraser when picked up.
* : No effect.
* /  /  / 's revive: Lowers the Eraser's range drastically and can only be improved with tear height ups.
* / : Erasing a Charger will prevent all newly created friendly Chargers from spawning, rendering the item useless as this item spawns a normal Charger before changing it to the special My Shadow variant.
* : Attempting to recharge the Eraser with the Sharp Plug hurts Isaac for half a heart without recharging the item.

## Trivia

* Eraser originates from the *Antibirth* mod. In *Antibirth*, this item was single use and wouldn't permanently remove an erased boss from the run, but could kill any boss in one hit.
	+ The Pickup quote was "Erase your enemies!".
* This item's effect is similar to the scroll of genocide that appears in traditional roguelikes such as *NetHack*, originating in the *Hack* variant *Hack121*.