Binding of Isaac: Rebirth Wiki
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* {{i|Dr. Fetus}}: Not recommended. Bombs have a very low range, making self-damage very likely.
 
* {{i|Dr. Fetus}}: Not recommended. Bombs have a very low range, making self-damage very likely.
 
* {{i|Epic Fetus}}: Overrides Kidney Stone.
 
* {{i|Epic Fetus}}: Overrides Kidney Stone.
* {{dlc|a+}} [[The Forgotten]]: The item works normally for The Soul, but The Forgotten will fire the stone and swing his club rapidly instead of shooting.
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* {{dlc|a+}} [[The Forgotten]]: The item works normally for The Soul, but The Forgotten will swing his club rapidly instead of shooting the burst of tears (The Forgotten still fires the stone normally).
 
* {{i|Haemolacria}}: Overridden by Haemolacria. Only stat changes apply.
 
* {{i|Haemolacria}}: Overridden by Haemolacria. Only stat changes apply.
 
* {{i|Jacob's Ladder}}: The tear barrage will spawn sparks as normal; however, the stone will only spawn sparks when hitting enemies.
 
* {{i|Jacob's Ladder}}: The tear barrage will spawn sparks as normal; however, the stone will only spawn sparks when hitting enemies.

Revision as of 17:48, 22 November 2020

(except in Rebirth)

Kidney Stone is an unlockable passive item added in Afterbirth.

Effects

  • -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

  • 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

  • Tints tears red. This is only a cosmetic change.
  • Collectible Incubus iconIncubus 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 Collectible Cursed Eye iconCursed 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.

Synergies

  • Collectible 20 20 icon20/20/Collectible The Inner Eye iconThe Inner Eye/Collectible Mutant Spider iconMutant Spider: Fires more tears in tear barrage. Only fires one stone.
  • (in Afterbirth † and Repentance)Collectible Angelic Prism iconAngelic Prism: The stone and tear barrage will quadruple if they pass through the prism.
  • (in Afterbirth † and Repentance)Collectible Compound Fracture iconCompound Fracture/Collectible Cricket's Body iconCricket's Body/Collectible The Parasite iconThe Parasite: The stone cannot split into smaller stones.
  • (in Afterbirth † and Repentance)Collectible Lachryphagy iconLachryphagy: Fires a barrage of tears that tend to clump together into larger tears, along with a kidney stone which can also be fed and bursts.
  • (in Afterbirth † and Repentance)Collectible Pop! iconPop!: Fires a barrage of eyeball tears, and the stone behaves like an eyeball tear.
  • (in Afterbirth † and Repentance)Collectible Technology Zero iconTechnology Zero: Fires a barrage of tears connected via electricity. The stone will also be connected via electricity.
  • (in Afterbirth † and Repentance)Collectible Trisagion iconTrisagion: Behaves exactly as expected, except everything looks like beams.

Interactions

  • Collectible Anti-Gravity iconAnti-Gravity: The stone will not hover and will travel regardless; otherwise behaves as expected.
  • Collectible Brimstone iconBrimstone: No effect. Speed down still applies. Range down applies to Azazel's Brimstone, making it difficult to use at base range.
  • Collectible Dr. Fetus iconDr. Fetus: Not recommended. Bombs have a very low range, making self-damage very likely.
  • Collectible Epic Fetus iconEpic Fetus: Overrides Kidney Stone.
  • (in Afterbirth † and Repentance) The Forgotten: The item works normally for The Soul, but The Forgotten will swing his club rapidly instead of shooting the burst of tears (The Forgotten still fires the stone normally).
  • (in Afterbirth † and Repentance)Collectible Haemolacria iconHaemolacria: Overridden by Haemolacria. Only stat changes apply.
  • (in Afterbirth † and Repentance)Collectible Jacob's Ladder iconJacob's Ladder: The tear barrage will spawn sparks as normal; however, the stone will only spawn sparks when hitting enemies.
  • Collectible Libra iconLibra: The harsh speed and range down make Libra potentially a large stats down. Stats are increased during the barrage.
  • Collectible The Ludovico Technique iconThe Ludovico Technique: Overrides Kidney Stone. Tear becomes red (cosmetic change).
  • Collectible A Lump of Coal iconA Lump of Coal: The stone will not change in appearance or grow bigger as it travels, but it will increase in damage as it travels.
  • Collectible Marked iconMarked: Occasionally, Isaac will stop automatically firing, and an attack key must be held to release the kidney stone and continue firing.
  • Collectible Mom's Knife iconMom's Knife: Overrides Kidney Stone.
  • Collectible Monstro's Lung iconMonstro's Lung: Overrides Kidney Stone.
  • Collectible Number One iconNumber One: Number One's range down overrides Kidney Stone, for an additional -0.62. The stone is not affected by the range decrease.
  • Collectible Soy Milk iconSoy Milk: The stone will be reduced to starting tear damage and is significantly smaller.
  • Collectible Technology iconTechnology: Overrides Kidney Stone.
  • Collectible Tech X iconTech X: Overrides Kidney Stone.
  • Collectible Tiny Planet iconTiny Planet: The stone and barrage of tears that follow orbit the character.

In-game Footage

Trivia

  • 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

PC ZX84 DLBX (First floor treasure room) (Both modes)