Infernal Temptation

The imp offers a non-fiend within 15 feet a bargain, granting a boon of good luck if the creature accepts. The boon lasts for 1 hour once accepted. If the creature dies while the boon is in place, its soul travels to Hell, where it is bound for eternity and unable to be raised or resurrected except by wish or similar magic. Once during the hour, the creature can roll an attack roll or saving throw twice and use the higher result.