Luck

Luck affects all uses in-game of the Random Number Generator (RNG). This includes chances to spawn rare mobs, odds for a mob to drop some loot, and selection of the loot on the various Drop Tables.
There are numerous items in the game that can affect Luck for you and your party. These include, but are not limited to, the following:
* - 30% increase for 15 minutes
* - 50% increase for 1 day
* - 50% increase for 7 days
* - 50% increase for 14 days
* - 50% increase for 30 days
* - 100% increase for 1 hour 
* - increases luck at crafting results by 10.0% for 1 day
* - increases luck at crafting results by 25.0% for 1 day
* - increases luck at crafting results by 100.0% for 1 day
* - increases luck at crafting results by 100.0% for 7 days
* - increases luck at crafting results by 100.0% for 30 days