Kidney Stone

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Kidney   Stone
Item icon
Item altar
"Matt's kidney stone"
Table dividing line 1.png
Item ID
Tear Appearance
Tear appearance
Table dividing line 2.png
Table dividing line 3.png
Collection Grid
Added in Afterbirth † / Removed in Repentance(page 4, column 15, row 4)
Removed in Afterbirth †(page 4, column 15, row 4)
Added in Repentance(page 4, column 16, row 4)
Added in Afterbirth

Kidney Stone is an unlockable passive item added in The Binding of Isaac: Afterbirth.

Effects[edit | edit source]

  • Removed in Repentance -0.2 speed and maximum speed.
  • -17 range.
  • +2.0 tear height.
    • The increased tear height and decreased range results in overall slightly less firing distance.
  • Occasionally, firing tears will cause Isaac to charge an attack with his head pulsating with a red color. After the attack has charged up, the fire button can be released to fire a kidney stone that does 5 times Isaac's damage and pierces enemies, followed by a rapid, inaccurate spray of tears.
    • This effect occurs approximately every 25 seconds.
    • Isaac won't be able to fire tears normally until the kidney stone has been fired.
    • The kidney stone has approximately twice the range of normal tears.
    • The barrage will continue for its full length between rooms, as will the state of charging the attack instead of firing tears.
  • When Isaac has half a heart left, the urine that appears underneath Isaac upon entering rooms will be changed to red.

Strategy[edit | edit source]

  • Activating this item before entering a difficult room, like a boss room, can allow you to deal a lot of damage right away. To do this, simply hold the attack button until you stop shooting tears.

Notes[edit | edit source]

  • If Isaac enters a room with half a heart he will leave a puddle of urine on the ground, if Isaac has kidney stone the puddle will be red.
  • Tints tears red. This is only a cosmetic change.
  • 15►Incubus Incubus will still fire tears normally while retaining the barrage effect, making this a good item for Lilith.
    • The barrage from the Incubus will be in a straight line (similar to 15►Cursed Eye Cursed Eye) instead of an inaccurate burst.
    • The kidney stone itself will come out of Lilith, not the Incubus follower, even though she cannot fire tears. The barrage of tears will still only come from the Incubus.
    • This is the only item to be able to override the Grayscale easter egg.

Interactions[edit | edit source]

  • 15►20/20 20/20/15►The Inner Eye The Inner Eye/15►Mutant Spider Mutant Spider: Only fires one stone.
  • 15►Anti-Gravity Anti-Gravity: The stone will not hover and will travel regardless.
  • Azazel/15►Brimstone Brimstone: Overrides Kidney Stone. Speed and range downs still apply.
  • 15►Dr. Fetus Dr. Fetus: Overrides Kidney Stone. The range down is especially harmful with Dr. Fetus, making self-damage very likely.
  • 15►Epic Fetus Epic Fetus: Overrides Kidney Stone.
  • Added in Afterbirth †15►Compound Fracture Compound Fracture/15►Cricket's Body Cricket's Body/15►The Parasite The Parasite: The stone cannot split into smaller stones.
  • Added in Afterbirth † The Forgotten: The Forgotten will swing his club rapidly instead of shooting the burst of tears (The Forgotten still fires the stone normally).
  • Added in Afterbirth †15►Haemolacria Haemolacria: Overridden by Haemolacria. Only stat changes apply.
  • Added in Afterbirth †15►Jacob's Ladder Jacob's Ladder: The stone will only spawn sparks when hitting enemies.
  • 15►Libra Libra: The harsh speed and range down make Libra a large stats down. Stats are increased during the barrage.
  • 15►The Ludovico Technique The Ludovico Technique: Overrides Kidney Stone.
  • 15►A Lump of Coal A Lump of Coal: The stone will not grow bigger as it travels, but it will increase in damage.
  • 15►Marked Marked: Occasionally, Isaac will stop automatically firing, and an attack key must be held to release the kidney stone and continue firing.
  • 15►Mom's Knife Mom's Knife: Overrides Kidney Stone.
  • 15►Monstro's Lung Monstro's Lung: Overrides Kidney Stone.
  • 15►Number One Number One: Number One's range down overrides Kidney Stone, for an additional -0.62. The stone is not affected by the range decrease.
  • Added in Repentance15►Spirit Sword Spirit Sword: Overrides Kidney Stone.
  • 15►Technology Technology: Overrides Kidney Stone.
  • 15►Tech X Tech X: Overrides Kidney Stone.

In-game Footage[edit | edit source]

Trivia[edit | edit source]

  • This item is a reference to the kidney stone that Matt Kap had removed in 2015, hence "Matt's kidney stone".
    • Matt Kap was a pixel artist on The Binding of Isaac: Rebirth and its expansions.

Seeds[edit | edit source]

PC Normal and hard modes only ZX84 DLBX (First floor Treasure Room)

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