SRD:Lucky

Lucky: A lucky weapon offers a second chance at success. Once per day, the wielder can reroll a failed attack roll (whether a single attack or one in a series of multiple attacks) as a free action. The rerolled attack uses the same bonuses or penalties as the missed roll.

Moderate clairsentience; ML 8th; Craft Psionic Arms and Armor, fate of one; Price +1 bonus.