Luck

Luck improves the following things:

It increases the amount of consumables dropped by enemies.
It increases the chance that a consumables dropped is a Loot Crate (including those from Trees).
It Improves the Tier of Items found in Loot Crates and in the Shop.
It Improves the Tier of Upgrades being offered when leveling up.
Some Characters, Items, and Weapons scale with Luck for damage.

Positive Luck multiplies your chances, so 100% luck doubles your chances. While negative luck divides your chances of finding higher tier upgrades, items, and weapons. So -100% luck halves your chances. For Consumables, negative luck multiplies your chances, so -50 Luck halves the amount of consumables dropped and -100 Luck means no consumables will drop at all, except from Loot Hoarders, Elites, and Bosses, which are guaranteed to drop Consumables.

While luck in itself has no limit, several of its benefit have maximums or diminishing returns.

For example, the rarity of items and upgrades offered, already naturally increases with the wave number, and has a maximum chance, that you already hit in the later waves naturally even with 0 luck. So additional luck only helps earlier in the game with getting Tier 2 and 3 items and upgrades. However it takes about 290 Luck before you reach the maximum on Legendary items and Upgrades.

Check Rarity of Shop Items to see details on Luck's effect on shop rarities.

Whenever an enemy drops a consumable, that consumable has a chance to be a Loot Crate. This chance is multiplied by Luck. Since 100 Luck both doubles the chances for a consumable to drop, and doubles the chance for that consumable to be a loot chest, 100 luck increases the chance for the first chest to drop by 300%.

But note that each Item Box dropped reduces the chance of the next dropping, giving you some diminishing returns.

Formula for loot crate drop chance:

Enemy_Box_Drop_Chance * (100% + Luck) / (1 + Box_Spawned_This_Wave)

Luck can be seen as an investment into your economy, and even become a powerful method of Healing when combined with Lemonade and Weird Food, if you have high enough luck. There isn't diminishing returns on the chance for Consumables to drop.

Items

Positive

The following Characters have a higher chance to find these items in the Shop: Lucky

Name	Rarity	Effects	Base Price	Limit	Unlocked By
Bowler Hat	Tier 3	+15 Luck +18 Harvesting -5 % Attack Speed -3 % Crit Chance	75		Win a run with Entrepreneur
Clover	Tier 3	+20 Luck +6 % Dodge -2 % Life Steal	65
Lost Duck	Tier 1	+8 Luck -1 Elemental Damage	25
Lucky Charm	Tier 3	+30 Luck -2 Melee Damage -1 Ranged Damage	75		Win a run with Lucky
Lucky Coin	Tier 4	+2 Luck for every 1 % Crit Chance you have -2 Armor	105	1
Metal Detector	Tier 2	+5% chance to double the value of picked up materials +6 Luck +2 Engineering -5 % Damage	40	20
Panda	Tier 4	+12 Max HP +25 Luck -5 % Damage	100		Win a run with Pacifist
Potato	Tier 4	+3 Max HP +2 HP Regeneration +1 % Life Steal +5 % Damage +5 % Attack Speed +3 % Speed +3 % Dodge +1 Armor +5 Luck	95		Win a run with Well Rounded
Propeller Hat	Tier 1	+10 Luck -2 % Damage	28
Shady Potion	Tier 2	+20 Luck -2 HP Regeneration	48
Wolf Helmet	Tier 4	+10 Elemental Damage +20 Luck -5 Engineering	90

Positive - Healing

These items positively affect your healing from consumables. They are also tagged as Luck, so Lucky has a higher chance of finding them in the shop.

Name	Rarity	Effects	Base Price	Limit	Unlocked By
Extra Stomach	Tier 4	+1 Max HP when picking up a consumable while at maximum health (max +8 per wave)	100	1
Lemonade	Tier 1	+1 HP recovered from consumables	15
Spicy Sauce	Tier 2	+3 Max HP Consumables have a 33% chance to explode for 10 (+100%) damage when picked up	40	3	Win a run with Glutton
Weird Food	Tier 1	+2 HP recovered from consumables -2 % Dodge	20

Negative

Name	Rarity	Effects	Base Price	Unlocked By
Alien Magic	Tier 3	+8 Max HP +3 HP Regeneration -8 Luck	85
Fin	Tier 3	+10 % Speed +3 % Life Steal -8 Luck	65	Win a run with Speedy
Medikit	Tier 4	+10 HP Regeneration +2 HP Regeneration every 5 seconds until the end of the wave -10 Luck	95	Win a run with Doctor
Mushroom	Tier 1	+3 HP Regeneration -2 Luck	25
Terrified Onion	Tier 1	+4 % Speed -5 Luck	15

Negative - Healing

These items negatively affect your healing from consumables.

Name	Rarity	Effects	Base Price	Limit	Unlocked By
Alien Worm	Tier 1	+3 Max HP +2 HP Regeneration -1 HP recovered from consumables	15

Affected Items

Some items that deal damage scale with your Luck stat.

Name	Rarity	Effects	Base Price	Limit	Unlocked By	Tags
Baby Elephant	Tier 1	25% chance to deal 1 (25%) damage to a random enemy when you pick up a material	22			Luck, Pickup
Cyberball	Tier 2	25% chance to deal 1 (25%) damage to a random enemy when an enemy dies	30			Luck

Characters

These Characters start with different Luck, or have mechanics related to their Luck:

Positive Characters

Name	Stats	Unlocked By	Unlocks
Chef(DLC)	+35 Luck +200% damage from non elemental sources against burning targets Consumables explode for 5x1 (+100%) burning damage when picked up You start with 1 Scared Sausage +100 % Enemy health Elemental Damage modifications are reduced by 75%	Have at least 25 enemies burning at the same time	Spoon
Druid(DLC)	+5 Max HP +15 Luck Enemies have a higher chance of dropping fruits 33% chance to get +1 Luck when you pick up a fruit 33% of fruits are poisoned and hurt you (ignores Dodge and Armor) -100 HP Regeneration -100 % Life Steal Engineering modifications are reduced by 50%	Collect 250 consumables by the end of wave 20	Cauldron
Glutton	+50 Luck +1 % Explosion Damage when picking up a consumable while at maximum health Consumable have a 100% chance to explode for 10 (500% ) damage when picked up +25 % Items Price -25 % XP Gain	Pick up 20 consumables during a run	Spicy Sauce
Lucky	+100 Luck Luck modifications are increased by 25% +75% chance to deal 1 (15%Luck) damage to a random enemy when you pick up a material -60% Attack Speed -50% XP Gain	Collect 300 materials	Lucky Charm
King	+50 Luck +25 % Damage for every Tier IV weapon you have +25% Attack Speed for every Tier IV weapon you have +5 Max HP for every different Tier IV item you have -15% Damage for every Tier I weapon you have -15% Attack Speed for every Tier I weapon you have -2 Max HP for every different Tier I item you have UNLISTED BONUS: Starting weapon is Tier II	Get 3 tier IV weapons at once	Excalibur

Negative Characters

Name	Stats	Unlocked By	Unlocks
Gladiator	+20% Attack Speed for every different weapon you have +5 Melee Damage You can't equip ranged weapons -40% Attack Speed -30 Luck	Kill 20000 enemies	Spider
Vagabond	Equipped weapons always contribute to the class bonuses of other equipped weapons You can't equip two of the same weapon at the same time -5 Armor -5 % Dodge Luck modifications are reduced by 50% Harvesting modifications are reduced by 50%	Have 6 different weapons at once	Jelly

Weapons

These Weapons scale with Luck for their damage.

Name	Class	Damage	Attack Speed	DPS	Crit Damage/Chance	Range	Knockback	Lifesteal	Special Effects	Base price	Unlocked by
Flute(DLC)	Musical	5(+50%+10%) 8(+50%+15%) 11(+50%+20%) 15(+50%+25%)	1.2s 1.12s 1.03s 0.95s	4.2(41.7%8.3%)/s 7.2(44.8%13.4%)/s 10.6(48.4%19.4%)/s 15.8(52.6%26.3%)/s	x1.5 (3% chance) x1.5 (3% chance) x1.5 (3% chance) x1.5 (3% chance)	300 325 350 375	0 0 0 0	0 0 0 0	Hitting an enemy that has less than 60%/65%/70%/75% health has a 10%/15%/20%/25% chance to charm it for 8 seconds	20 45 80 165	Win a run with Romantic
Lute(DLC)	Musical, Support	4(+50%+10%) 8(+50%+15%) 12(+50%+20%) 16(+50%+25%)	1.31s 1.25s 1.2s 1.14s	3.1(38.1%7.6%)/s 6.4(39.9%12%)/s 10(41.7%16.7%)/s 14(43.8%21.9%)/s	x1.5 (3% chance) x1.5 (3% chance) x1.5 (3% chance) x1.5 (3% chance)	150 175 200 225	2 2 2 2	0 0 0 0	Enemies hit take 10% more damage for 3 seconds (max: 30%/50%/70%/100%)	15 31 61 122	Default