Luck

LUK
Luck: Each 1 LUK provides the following:
 * Critical Rate (enhanced damage, non-evadable attack) +0.3%
 * Every 1 LUK: ATK +0.1%
 * Every 1 LUK: MATK +0.1%
 * Every 1 LUK: DEX +0.1%

LUK does not effect ingame drop rates, or chances to get a rarer item when killing. It's simply based on in-game percents and not LUK as a stat. LUK Specific:
 * Blacksmiths: Forging success rate +0.1%
 * Alchemists: Brewing success rate +0.1%
 * Cooking success rate +0.1%
 * Resistance to some status effects:
 * Blind: slightly decreases chance from being inflicted
 * Curse: -0.3% chance from being inflicted
 * Frozen: slightly decreases from being inflicted
 * Poison: slightly decreases chance from being inflicted
 * Silence: slightly decreases from being inflicted
 * Sleep: slightly decreases from being inflicted
 * Stone Curse: slightly decreases chance from being inflicted
 * Stun: slightly decreases chance from being inflicted
 * The calculation to see actual CRIT rate: CRIT = [LUK * 0.3] + 1
 * Critical
 * ATK
 * MATK
 * Status Effects
 * Does not affect drop rate