Failsafe (3.5e Equipment)
From D&D Wiki
A failsafe weapon is inscribed with runes related to various gods of luck and fortune. Upon rolling a natural 1 when using a failsafe weapon, you can choose to ignore the effects of a natural 1 (typically an automatic miss, or worse in some games). Your attack is not re-rolled, but if your blow would have hit otherwise with 1 + your attack score, then you hit. Otherwise you miss, but incur no further effects of a fumble. You may activate this power 3/day as a free action.
If you have luck points, such as from feats, domain, or enhancement, you gain 1 additional luck point a day when using this weapon.