Luck

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Attributes

Attribute luck icon.png Luck affects a variety of chance-based effects and is represented by a 3-leaf clover.

The large majority of characters have a base Luck of 0. The following characters are exceptions:

Character Luck
(except in Rebirth) Character Keeper icon.pngKeeper (in Repentance and Repentance+) Character Dead Tainted Lazarus icon.pngDead Tainted Lazarus (in Repentance and Repentance+) Character Tainted Keeper icon.pngTainted Keeper -2
Character Lazarus icon.pngLazarus (in Repentance and Repentance+) Character Esau icon.pngEsau -1
(in Repentance and Repentance+) Character Jacob icon.pngJacob 1
  • Character Eden icon.pngEden and (in Repentance and Repentance+) Character Tainted Eden icon.pngTainted Eden: varies between -1 and 1, inclusive (including decimal values).
  • Character Cain icon.pngCain's base Luck is technically 0, but he starts with Lucky Foot, increasing his luck to 1.

Effects of Luck

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 (except in Repentance and Repentance+) 66%/(in Repentance and Repentance+) 33% of heart-type drops, replacing them with nothing.
    • (in Repentance and Repentance+) If there is more than one playable character on screen (Jacob and Esau, Co-op, using the item (in Repentance and Repentance+)Strawman, etc.) the room drop rate depends on the total luck the 2 characters have.
  • 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 high 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.
    • Most tear effect chances scale exponentially with luck, while a few others scale linearly with luck, meaning that it can take a lot of luck to notice a significant increase in activation rates in most cases.
    • However not all effects scale up to 100%, and some items have the rates capped at a lower percentage. If the maximum activation rate is not 100% for an item, the true maximum rate will be listed instead.
    • Tear items affected by Luck are:
    • Trinkets affected by Luck are:
    • Other items affected by Luck include:
      • (in Repentance and Repentance+)Athame: Black brimstone circles are created more often with higher luck, up to 100% of the time at 30 Luck.
      • (except in Rebirth and Afterbirth)Broken Modem: Higher luck increases the rate of freezing enemies and their shots.
      • Celtic Cross: The Celtic Cross grants its invulnerability more often with higher Luck, topping out at 100% at 26.67 Luck.
      • Gimpy: The Soul Heart drop chance upon taking damage increases with higher Luck, topping out at (except in Repentance and Repentance+)50% with 20 Luck / (in Repentance and Repentance+)100% at 46 Luck.
      • Midas' Touch: Poops generated by Isaac's actions have a chance to turn into Golden Poop, with the chance depending on the source.
      • (except in Rebirth and Afterbirth)Mystery Gift: Higher luck results in a lower chance of getting The Poop or A Lump of Coal.
      • Old Bandage: The Red Heart drop chance when you take a hit increases with higher Luck, topping out at (except in Repentance and Repentance+)50% with 26.67 Luck / (in Repentance and Repentance+)100% at 80 Luck.
      • Virgo: The shield activation chance increases with Luck, topping out at 100% at 10 Luck.
      • (in Repentance and Repentance+)Dirty Mind: Rocks can be replaced by poops depending of Luck, capping at 10% with 7.5 Luck.

However, Luck doesn't affect:

Items that affect Luck

Activated Items

Name ID Icon Quote Description (in Repentance and Repentance+) Quality
(except in Rebirth and Afterbirth) Dataminer 5.100.481
Dataminer4 rooms
 109 Displaces enemy sprites for the current room and randomly increases one of Isaac's stats while decreasing another. (in Repentance+) Turns all items in the room into glitched items with random effects. 0
(except in Rebirth) Mom's Box 5.100.439
Mom's Box4 rooms
(in Rebirth and Afterbirth)
Whats inside?
(except in Rebirth and Afterbirth)
What's inside?
 Increases luck by 1 and doubles the effects of trinkets while held. When used, drops a random trinket on the ground. 2
(except in Rebirth and Afterbirth) Void 5.100.477
Void4 rooms
 Consume Consumes all pedestal items in the room. Activated items will have their effects added to Void, and passive items will grant random stat upgrades.
(except in Repentance+)
4
(in Repentance+)
3

Passive Items

Name ID Icon Quote Description (in Repentance and Repentance+) Quality
(in Repentance and Repentance+) Binge Eater 5.100.664 Binge Eater All you can eat +1 Red Heart Container and fully heals Isaac. Item pedestals also offer a random food item. Picking up a food item temporarily grants +3.6 damage and permanently boosts 2 stats. 4
(in Repentance and Repentance+) Candy Heart 5.100.671 Candy Heart Power of love Gives Isaac a permanent stat boost whenever he heals with Red Heart.pngRed Heart pickups. 1
(except in Rebirth and Afterbirth) Death's List 5.100.530 Death's List Just hope you're not next... Grants a pickup or stat upgrade if all enemies in a room are killed in the order they are marked.
(except in Repentance+)
2
(in Repentance+)
1
(in Repentance and Repentance+) Evil Charm 5.100.632 Evil Charm Luck up + you feel protected +2 luck. Provides immunity to burn, confusion, fear, and poison. (in Repentance+) Prevents slowdown from cobwebs, and allows Isaac to stand in enemy creep for 1 second before taking damage.
(except in Repentance+)
2
(in Repentance+)
1
Experimental Treatment 5.100.240 Experimental Treatment
(except in Repentance and Repentance+)
All stats up... then shuffled
(in Repentance and Repentance+)
Some stats up, some stats down
 (in Rebirth and Afterbirth) Randomly increases and decreases some of Isaac's stats.
(except in Rebirth and Afterbirth) Increases four random stats and decreases the other two. 		1
(in Repentance and Repentance+) Glass Eye 5.100.730 Glass Eye DMG + luck up +0.75 damage, +1 luck. 3
Latch Key 5.100.343 Latch Key Luck up Grants 1 Soul Heart.pngSoul Heart and +1 luck. Spawns 2 Key.pngKeys. 1
Lucky Foot 5.100.46 Lucky Foot Luck up +1 luck. Improves Isaac's chances at various random events (independent from the luck stat). (in Repentance and Repentance+) Converts all bad pills into good pills, without identifying them. 2
Magic Scab 5.100.253 Magic Scab HP + luck up Grants one full Red Heart container, +1 luck. (in Repentance and Repentance+) Heals 1 additional Red Heart.pngRed Heart. 2
Missing No. 5.100.258 Missing No. Syntax error Randomizes all passive items and stats upon pickup and at the start of each succeeding floor. 0
(except in Rebirth) Mom's Pearls 5.100.355 Mom's Pearls Range + luck up (except in Repentance and Repentance+) +1.25 range, +0.5 tear falling speed, +1 luck.
(in Repentance and Repentance+) +2.5 range, +1 luck. Grants one Soul Heart.pngSoul Heart. 		2
My Reflection 5.100.5 My Reflection
(except in Repentance and Repentance+)
Boomerang tears
(in Repentance and Repentance+)
Boomerang tears + DMG up + luck down
 Gives Isaac's tears a boomerang effect. (except in Repentance and Repentance+) +1.5 range, +1 tear falling speed, x1.6 shot speed multiplier. (in Repentance and Repentance+) 2x + 1.5 range, +1.5 damage, -1 luck, 1.6x shot speed multiplier.
(except in Repentance+)
2
(in Repentance+)
3
(in Repentance and Repentance+) Sausage 5.100.669 Sausage All stats up Adds a Red Heart Container, fully heals Isaac, and gives +0.2 Speed, +0.5 Damage, +0.5 Tears, +2.5 Range, +0.2 Shot Speed, and +1.0 Luck. Increases the chance of encountering a Devil RoomDevil Room, Angel RoomAngel Room, and/or PlanetariumPlanetarium each by 6.9%. 3
(in Repentance and Repentance+) Sol 5.100.588 Sol Radiant victory Reveals the location of the Boss RoomBoss Room. Upon defeating a boss, activates XIX - The SunXIX - The Sun, fully recharges Isaac's active item, grants bonus damage and luck for the rest of the floor, and removes curses. 2
(in Repentance and Repentance+) Soul Locket 5.100.686 Soul Locket Power of faith Gives Isaac a permanent stat boost whenever he picks up a Soul Heart.pngSoul Heart. 1
(except in Rebirth and Afterbirth) YO LISTEN! 5.100.492 YO LISTEN! Yo listen! +1 luck. Spawns a fairy familiar that points out Secret RoomSecret Rooms, Crawl SpaceCrawl Space entrances, and tinted rocks. 2

Trinkets

Name ID Icon Quote Description
(in Repentance and Repentance+) Broken Syringe 5.350.132 Broken Syringe Mystery medicine Grants a chance to gain a random syringe effect for the current room.
(except in Rebirth and Afterbirth) Dim Bulb 5.350.101 Dim Bulb I think it's broken Provides a boost to all stats when Isaac's active item is completely uncharged.
Lucky Toe 5.350.42 Lucky Toe Luck up! +1 Luck. Adds a chance to drop an extra pickup when opening a Chest.pngChest, destroying a machine, or blowing up a tinted rock.
(in Repentance and Repentance+) Mom's Lock 5.350.153 Mom's Lock A piece of her love Grants the effects of a random Mom item each room.
(in Repentance and Repentance+) Perfection 5.350.145 Perfection Luck way up. Don't lose it! +10 Luck. If Isaac takes damage, the trinket is destroyed and its effect is removed.
(except in Rebirth and Afterbirth) Vibrant Bulb 5.350.100 Vibrant Bulb It needs power Provides a boost to all stats when Isaac's active item is fully charged.

Other

  • "Luck Up" pills increase luck by 1, and "Luck Down" pills decrease Luck by 1.
  • Putting a coin in the Donation Machine.pngDonation Machine has a 2% chance to increase Luck by 1.
    • (in Repentance and Repentance+) Having KarmaKarma increases this chance.
  • (except in Rebirth) Lucky Penny.pngLucky Pennies increase Luck by 1.
  • (except in Rebirth) In co-op, Green Baby will occasionally briefly increase Luck by 2. Dark Baby will occasionally briefly increase all stats, including Luck.
  • (except in Rebirth and Afterbirth) Absorbing an item using Black RuneBlack Rune can increase Luck by 1.
  • (in Repentance and Repentance+) Certain wisps (such as those generated by Fortune Cookie + Book of Virtues synergy) increase Luck by 0.2 per wisp.

Trivia

  • Unlike the most common representation, the in-game icon for Luck has 3 leaves instead of 4.
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