Binding of Isaac: Rebirth Wiki

Added in Afterbirth †

Sharp Straw is an activated item added in The Binding of Isaac: Afterbirth †.


  • Damages all enemies in the room.
    • The damage dealt is equal to Isaac's current tear damage plus 10% of the enemy's max health.
  • Has a 15% chance to drop Half Red Heart Half Red Hearts when it damages an enemy.
    • Removed in Repentance May also drop Half Soul Heart Half Soul Hearts. Half red hearts will always drop when the player has at least one red heart container; otherwise, half soul hearts will drop.
    • The amount of enemies damaged does not improve the chance.


  • When used on Delirium Delirium, this item should be used when it isn't transformed to deal the most damage, as Delirium doesn't have his armor up when in his true form.
  • For enemies that can disappear or go underground, it only affects them if they are visible.


  • Added in RepentanceBook of Virtues Book of Virtues: Enemies have a chance to spawn wisps when they’re killed by Sharp Straw. Using it in a room with no enemies does not grant a wisp. Despite Sharp Straw having a timed charge, the wisps persist between rooms.
  • Car Battery Car Battery: Damage is doubled and two half hearts may be dropped.


  • Added in Repentance Ipecac Ipecac: Only provides a +2 damage bonus instead of +40.

In-game Footage[]


  • Before Booster Pack #5, Sharp Straw would instantly kill Big Horn Big Horn if used while his hands were out due to their arbitrarily high health.
  • Sharp Straw was originally an unofficial item which was supposed to showcase the modding capabilities of Afterbirth+ in the PAX 2016 livestream. However, all items included in the demo were later added to the final game.
    • In the livestream, Sharp Straw had the name 'Isaacula', a different appearance, and a recharge time of six rooms.


PC Added in Repentance MTXA MYN1 - Treasure room adjacent to spawn

PS4 Normal mode only 9ZCN MD0L - First room on the right