Kidney Stone

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Font TeamMeat K.pngFont TeamMeat i.pngFont TeamMeat d.pngFont TeamMeat n.pngFont TeamMeat e.pngFont TeamMeat y.png   Font TeamMeat S.pngFont TeamMeat t.pngFont TeamMeat o.pngFont TeamMeat n.pngFont TeamMeat e.png
Item icon
Item altar
 
 
Table dividing line 1.png
 
5.100.440
 
Tear appearance
Table dividing line 2.png
 
Treasure Room Treasure Room
Greed mode only Treasure Room Treasure Room
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Added in Afterbirth †(page 4, column 15, row 4)
Removed in Afterbirth †(page 4, column 15, row 4)
 
Kidney Stone Removed in Afterbirth † Complete The Guardian (challenge #30)
Added in Afterbirth † Complete Onan's Streak (challenge #29)
Added in Afterbirth

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 an 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 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 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[edit | edit source]

  • 20/20 20/20/The Inner Eye The Inner Eye/Mutant Spider Mutant Spider: Fires more tears in tear barrage. Only fires one stone.
  • Added in Afterbirth †Angelic Prism Angelic Prism: The stone and tear barrage will quadruple if they pass through the prism.
  • Added in Afterbirth †Compound Fracture Compound Fracture/Cricket's Body Cricket's Body/The Parasite The Parasite: The stone cannot split into smaller stones.
  • Added in Afterbirth †Lachryphagy 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.
  • Added in Afterbirth †Pop! Pop!: Fires a barrage of eyeball tears, and the stone behaves like an eyeball tear.
  • Added in Afterbirth †Technology Zero Technology Zero: Fires a barrage of tears connected via electricity. The stone will also be connected via electricity.
  • Added in Afterbirth †Trisagion Trisagion: Behaves exactly as expected except everything looks like beams.

Interactions[edit | edit source]

  • Anti-Gravity Anti-Gravity: The stone will not hover and will travel regardless, otherwise behaves as expected.
  • Brimstone Brimstone: No effect. Speed down still applies. Range down applies to Azazel's Brimstone, making it difficult to use at base range.
  • Dr. Fetus Dr. Fetus: Not recommended. Bombs have a very low range, making self-damage very likely.
  • Epic Fetus Epic Fetus: Overrides Kidney Stone.
  • Added in Afterbirth † The Forgotten: When in skeletal form, the Forgotten will fire the stone and swing his club rapidly instead of shooting.
  • Added in Afterbirth †Haemolacria Haemolacria: Overridden by Haemolacria. Only stat changes apply.
  • Added in Afterbirth †Jacob's Ladder Jacob's Ladder: The tear barrage will spawn sparks as normal; however, the stone will only spawn sparks when hitting enemies.
  • Libra Libra: The harsh speed and range down make Libra potentially a large stats down. Stats are increased during the barrage.
  • The Ludovico Technique The Ludovico Technique: Overrides Kidney Stone. Tear becomes red (cosmetic change).
  • A Lump of Coal A Lump of Coal: The stone will not change the appearance or grow bigger as it travels but it will increase in damage as it travels.
  • Marked 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 Mom's Knife: Overrides Kidney Stone.
  • Monstro's Lung Monstro's Lung: Overrides Kidney Stone.
  • 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.
  • Soy Milk Soy Milk: Stone will be reduced to starting tear damage and is significantly smaller.
  • Technology Technology: Overrides Kidney Stone.
  • Tech X Tech X: Overrides Kidney Stone.
  • Tiny Planet 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 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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