xD No sirve para nada en especial, más que por los clasicos bonos que da.
http://irowiki.org/wiki/Stats#LUKLUKLuck: Each 1 LUK provides the following:
* Critical rate (DEF ignoring attack) +0.3%,
* Perfect dodge +0.1%
* Blacksmiths: forging success rate +0.1%
* Alchemists: brewing success rate +0.1%
* Cooking success rate +0.1%
* Every 5 LUK: reduces enemy's chance of landing critical attack by 1%
* Every 5 LUK: ATK +1
* Resistance to some status effects
o Blind: -1/3 % chance from being inflicted
o Curse: decreases chance from being inflicted (exact value unknown)
o Frozen: -1/3 % chance from being inflicted
o Poison: slightly decreases chance from being inflicted (exact value unknown)
o Silence: -1/3 % chance from being inflicted
o Sleep: -1/3 % chance from being inflicted
o Stone Curse: -1/3 % chance from being inflicted
o Stun: -1/3 % chance from being inflicted, -1/3% duration