Longsword of Piety

Weapon (longsword), rare (requires attunement)

Said to be a relic from a defunct religious order, this sword shines with a soft blue glow out to 10 feet, and grants you a +1 bonus to attack and damage rolls. In addition, the sword has 1 charge. At any time while you are wielding the sword, you can expend a charge to automatically succeed on one saving throw. The sword regains one charge after being bathed in holy water in the sunlight. This sword functions only as a normal longsword in the hands of anyone with an evil alignment and falls out of its wielder’s hands if the wielder seeks to harm an innocent, even if by magical compulsion.