Kidney Stone


5.100.440






Kidney Stone is an unlockable passive item added in Afterbirth.
Effects[edit | edit source]
- -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]
- Tints tears red. This is only a cosmetic change.
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
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.
- The barrage from the Incubus will be in a straight line (similar to
Synergies[edit | edit source]
20/20/
The Inner Eye/
Mutant Spider: Fires more tears in tear barrage. Only fires one stone.
Angelic Prism: The stone and tear barrage will quadruple if they pass through the prism.
Compound Fracture/
Cricket's Body/
The Parasite: The stone cannot split into smaller stones.
Lachryphagy: 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.
Pop!: Fires a barrage of eyeball tears, and the stone behaves like an eyeball tear.
Technology Zero: Fires a barrage of tears connected via electricity. The stone will also be connected via electricity.
Trisagion: Behaves exactly as expected, except everything looks like beams.
Interactions[edit | edit source]
Anti-Gravity: The stone will not hover and will travel regardless; otherwise behaves as expected.
Brimstone: No effect. Speed down still applies. Range down applies to Azazel's Brimstone, making it difficult to use at base range.
Dr. Fetus: Not recommended. Bombs have a very low range, making self-damage very likely.
Epic Fetus: Overrides Kidney Stone.
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).
Haemolacria: Overridden by Haemolacria. Only stat changes apply.
Jacob's Ladder: The tear barrage will spawn sparks as normal; however, the stone will only spawn sparks when hitting enemies.
Libra: The harsh speed and range down make Libra potentially a large stats down. Stats are increased during the barrage.
The Ludovico Technique: Overrides Kidney Stone. Tear becomes red (cosmetic change).
A 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.
Marked: Occasionally, Isaac will stop automatically firing, and an attack key must be held to release the kidney stone and continue firing.
Mom's Knife: Overrides Kidney Stone.
Monstro's Lung: Overrides Kidney Stone.
Number One: Number One's range down overrides Kidney Stone, for an additional -0.62. The stone is not affected by the range decrease.
Soy Milk: The stone will be reduced to starting tear damage and is significantly smaller.
Technology: Overrides Kidney Stone.
Tech X: Overrides Kidney Stone.
Tiny Planet: The stone and barrage of tears that follow orbit the character.
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 ZX84 DLBX (First floor treasure room) (Both modes)
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