Luck

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Attributes
Health Damage Tears Range Shot Speed Speed Luck Hidden Attributes

Luck Stat Icon.png Luck affects a variety of chance-based effects and is represented by a 3-leaf clover.

Effects of luck[edit | edit source]

Luck influences many different elements:

  • Room drops: For calculating room drops, luck is capped between 0 and 10, with higher luck not only resulting in higher amounts of drops but also higher quality drops such as chests.
    • Room drop rates are otherwise identical in Normal and Hard game modes, but Hard mode removes 65% of heart type drops, replacing them with nothing.
  • Tear effect chance: The chance of shooting tears with status effects becomes more likely as Luck goes up. This scales up to 100% chance per tear in most cases with enough Luck.
    • Most of the status inflicting effects require a very unlikely high number of Luck to activate on every tear.
      • Since these effects persist on the enemies for a set amount of time regardless of the Tears stat, a fast rate of fire is often enough to affect an enemy indefinitely.
    • Tear items affected by Luck are:
      • Abaddon AbaddonAbaddon Rebirth Icon.pngIncreases damage and speed, removes all red heart containers, grants six black hearts, and adds a chance to shoot fear tears. (Tears cause fear) - 100% at 85 Luck
      • Added in Afterbirth †Apple! Apple!Apple! Icon.pngIncreases tears. Adds a chance to fire a high-damage razor blade. (Razor tears) - 100% at 14 Luck
      • Ball of Tar Ball of TarBall of Tar Icon.pngAdds a chance to shoot slowing tears and the character leaves a trail of slowing creep behind as he moves, impeding enemies' speed. (Tears slow enemies) - 100% at 18 Luck
      • The Common Cold The Common ColdThe Common Cold Icon.pngAdds a chance to shoot poison tears, dealing damage over time when inflicted. (Poison tears) - 100% at 12 Luck
      • Dark Matter Dark MatterDark Matter Icon.pngIncreases Damage by 1 and adds a chance to shoot fear tears. (Tears cause fear) - 100% at 20 Luck
      • Added in Afterbirth †Euthanasia EuthanasiaEuthanasia Icon.pngAdds a chance to fire needles. If a needle kills an enemy, it bursts into more needles. (Needle tears) - 100% at 15 Luck
      • Added in  AfterbirthEvil Eye Evil EyeEvil Eye Afterbirth Icon.pngWhile firing tears, Isaac has a chance to fire an eye across the screen with a very slow shot speed, which will fire tears of its own in the same direction as Isaac. The eye will be destroyed if it comes into contact with an enemy or obstacle. (Eye tears) - Slight increase with high Luck
      • Fire Mind Fire MindFire Mind Icon.pngGrants flaming tears that deal burning damage over time. Tears have a chance to explode on impact with an enemy, which creates a fire at the location of the explosion. (Chance that tears explode) - 100% at 13 Luck
      • Added in  AfterbirthHoly Light Holy LightHoly Light Icon.pngIsaac has a random chance to fire a Holy tear, which, when it hits an enemy, will spawn a Crack the Sky-style light beam on the same enemy, dealing damage. (Tears inflict Crack the Sky Crack the SkyCrack the Sky Icon.png4 roomsSummons multiple beams of light in random locations around the room, dealing a large amount of damage to any enemy that touches them. effect) - Maximizes at 50% at 9 Luck
      • Iron Bar Iron BarIron Bar Icon.pngIncreases damage by 0.3 and adds a chance to shoot concussive tears, causing enemies to walk around randomly. (Tears confuse enemies) - 100% at 27 Luck
      • Added in Afterbirth †Little Horn Little HornLittle Horn Icon.pngAdds a chance to fire a piercing tear that instantly kills any enemy that it touches. (Instant death tears) - Slight increase with high Luck
      • Loki's Horns Loki's HornsLoki's Horns Icon.pngGives a random chance for projectiles to fire in all 4 cardinal directions. (4-way tears) - 100% at 7 Luck
      • Mom's Contacts Mom's ContactsMom's Contacts Rebirth Icon.pngAdds a chance to shoot petrifying tears, which stop enemies in place and prevent them from moving or attacking. Range up. (Tears petrify enemies) - Maximizes at 50% with less than 20 Luck
      • Mom's Eye Mom's EyeMom's Eye Rebirth Icon.pngAllows Isaac to fire tears from the back of his head. (Forwards and backwards tears) - 100% at 2 Luck
      • Mom's Eyeshadow Mom's EyeshadowMom's Eyeshadow Icon.pngTears have a chance to charm enemies. (Tears charm enemies) - 100% at 27 Luck
      • Mom's Perfume Mom's PerfumeMom's Perfume Icon.pngAdds a chance to shoot fear tears and decreases tear delay by 1. (Tears cause fear) - 100% at 85 Luck
      • Mom's Wig Mom's WigMom's Wig Icon.pngAdds a chance to spawn blue spiders when firing tears. Restores 1 red heart. (Spawn Blue Spiders while shooting) - 100% at 10 Luck
      • Added in Afterbirth †Parasitoid ParasitoidParasitoid Icon.pngAdds a chance to fire an egg sack which spawns slowing creep and spawns a blue fly or spider upon hitting an enemy. (Egg tears) - Maximizes at 50% with around 20 Luck
      • Spider Bite Spider BiteSpider Bite Icon.pngAdds a chance to shoot slowing tears, reducing speed of enemy movement and any projectile fired by them. (Tears slow enemies) - 100% at 15 Luck
      • Tough Love Tough LoveTough Love Rebirth Icon.pngAdds a chance to shoot a tooth instead of a tear, which deals greater damage than regular tears. (Teeth instead of tears) - 100% at 9 Luck
    • Trinkets affected by Luck are:
      • Added in Afterbirth †Black Tooth Black ToothBlack Tooth Icon.pngAdds a chance to fire a black tooth that poisons enemies. (Poisonous double damage tear) - 100% at 32 Luck
      • Cain's Eye Cain's EyeCain's Eye Icon.pngWhen starting a floor, 25% chance to get the The Compass effect for the duration of a floor. (The Compass The CompassThe Compass Rebirth Icon.pngReveals all special rooms (except secret rooms of any kind). effect) - 100% at 3 Luck
      • Cartridge CartridgeCartridge Icon.pngChance to trigger The Gamekid effect upon taking damage. (The Gamekid The GamekidThe Gamekid Icon.png6 roomsUpon use, turns the character into a into a Pac-Man-like creature for 5 seconds, granting invulnerability, inflicting fear on all enemies, and replenishing half a red heart container for every two enemies killed. effect when hit) - 100% at 38 Luck
      • Eve's Bird Foot Eve's Bird FootEve's Bird Foot Icon.png5% chance to spawn a Dead Bird familiar for the current room each time an enemy dies. (Spawn a dead bird on killing an enemy) - 100% at 8 Luck
      • Isaac's Fork Isaac's ForkIsaac's Fork Icon.pngA chance to heal Isaac for 1/2 a red heart upon clearing a room. (Heal half a heart on clearing a room) - 100% at 18 Luck
      • A Missing Page A Missing PageA Missing Page Icon.png5% chance to induce The Necronomicon's effect upon taking damage. (The Necronomicon The NecronomiconThe Necronomicon Icon.png6 roomsDamages all enemies in the room significantly. effect) - Maximizes at 50% with 50-60 Luck
      • Added in Afterbirth †Ouroboros Worm Ouroboros WormOuroboros Worm Icon.pngTears travel in a large spiral pattern and become spectral. (Chance to shoot homing tears) - 100% at 9 Luck
      • Pinky Eye Pinky EyePinky Eye Icon.pngAdds a 10% chance to shoot a poison tear, dealing damage over time when inflicted. (Poison tears) - 100% at 18 Luck
      • Push Pin Push PinPush Pin Icon.pngAdds a 10% chance to shoot a piercing and spectral tear. (Spectral + Piercing tears) - 100% at 18 Luck
      • Red Patch Red PatchRed Patch Icon.pngGrants a chance of increasing damage by 1.8 for the current room upon taking damage. (+1.8 Damage Up on taking damage) - 100% at 8 Luck
      • Samson's Lock Samson's LockSamson's Lock Icon.png1/15 chance to increase damage by 0.5 for the current room each time an enemy dies. (Chance for +0.5 Damage Up on killing an enemy) - 100% at 10 Luck
    • Other items affected by Luck include:
      • Added in Afterbirth †Broken Modem Broken ModemBroken Modem Icon.pngEnemies, enemy shots, tears, and pickups will briefly freeze in place at random intervals.: Higher luck increases the rate of freezing enemies and their shots.
      • Celtic Cross Celtic CrossCeltic Cross Rebirth Icon.pngGrants a chance to trigger the Book of Shadows effect upon taking damage, creating a shield that nullifies all types of damage for 7 seconds.: The Celtic Cross grants its invulnerability more often with higher Luck, topping out at 100% at 27 Luck.
      • Gimpy GimpyGimpy Icon.pngHas a chance of spawning a soul heart or black heart when taking damage. Enemies have a chance to drop a Half Red Heart after being killed.: The Soul Heart/Black Heart drop chance upon taking damage increases with higher Luck, topping out at 50% at 22 Luck.
      • Midas' Touch Midas' TouchMidas' Touch Icon.pngEnemies that touch you are stunned and turn gold. Any enemy killed while in this state will drop a coin.: Poops generated by Isaac's actions have a chance to turn into Golden Poop, starting at 10% with 0 Luck up to 100% at 18 Luck.
      • Added in Afterbirth †Mystery Gift Mystery GiftMystery Gift Icon.pngOne time useUpon use, spawns a random item from the current room's item pool, with a chance to spawn A Lump of Coal or The Poop instead.: Higher luck results in a lower chance of getting The Poop The PoopThe Poop Icon.png1 roomsSpawns a pile of poop where the character is standing and knocks nearby monsters back. May yield pickups like regular poop. or A Lump of Coal A Lump of CoalA Lump of Coal Icon.pngThe more distance tears travel, the more damage they will do..
      • Old Bandage Old BandageOld Bandage Icon.pngAdds one empty heart container. Whenever Isaac takes damage there's a chance that a Red Heart may drop.: The Red Heart drop chance when you take a hit increases with higher Luck, topping out at 50% at 29 Luck.
      • Virgo VirgoVirgo Icon.pngGrants a chance to trigger the Book of Shadows effect upon taking damage, creating a shield that nullifies all types of damage for 10 seconds. Also converts "bad pills" into "good pills".: The shield activation chance increases with Luck, topping out at 100% at 10 Luck.

However, Luck doesn't affect:

Items that affect luck[edit | edit source]

Activated Items[edit | edit source]

Name ID Icon Quote Description
Added in Afterbirth † Dataminer 481
Dataminer
4 rooms
109 Displaces enemy sprites for the current room, randomly increases one stat and decreases another.
Added in  Afterbirth Mom's Box 439
Mom's Box
4 rooms
What's inside? When used, Mom's Box will drop a random trinket on the ground. While held, increases luck by 1 and doubles the effects of trinkets.

Passive Items[edit | edit source]

Name ID Icon Quote Description
Latch Key 343 Latch Key Luck up Increases Luck by 1, grants 1 Soul Heart and spawns 2 Keys.
Lucky Foot 46 Lucky Foot Luck up +1 Luck. Increases chance of winning Shell Game Beggar. (Independent of luck stat)
Magic Scab 253 Magic Scab HP + Luck up Increases luck and HP by 1.
Missing No. 258 Missing No. Syntax error Randomizes all passive items upon pickup and at the start of each succeeding floor.
Added in  Afterbirth Mom's Pearls 355 Mom's Pearls Range + luck up +1.25 Range Up. +0.5 Tear Height. +1 Luck Up.
Added in Afterbirth † YO LISTEN! 492 YO LISTEN! Yo listen! +1 luck. Spawns a fairy familiar that points out secret room entrances and tinted rocks.

Trinkets[edit | edit source]

Name ID Icon Quote Description
Lucky Toe 42 Lucky Toe Luck up! Increases Luck by 1.

Other[edit | edit source]

  • "Luck Up" pills increase luck by 1, and "Luck Down" pills decrease luck by 1.
  • Added in  Afterbirth Lucky Pennies increase luck by 1.
  • Added in  Afterbirth In co-op, Green Baby will occasionally briefly increase luck by 2. Dark Baby will occasionally briefly increase all stats, including luck.


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