Luck is a stat in Dark Souls III. It determines the player's Item Discovery and the effectiveness with luck scaling weapons, such as the Man-grub's Staff, Anri's Straight Sword and Hollow-infused weapons, as well as increasing Bleed and Poison build-up.
Item Discovery determines the likelihood of an enemy dropping items. The higher it is, the easier it is to get drops.
Unlike other offensive stats, luck scaling is not displayed on the weapon's stat screen.
As with every other stat in the game, it also increases the player's defenses. As well, leveling Luck will increase the player's Curse resistance.