Weapon of Retribution

You call upon your deity to imbue one weapon with the power to seek justice against a specific, evil-aligned opponent. You choose the target at the time of casting; they don’t need to be present. You don’t need to know the target’s name, but it must be a creature you can identify, such as “the gnoll king’s champion” or “the fomorian who slew Sir Pelgram.” The next time the weapon of retribution attacks the chosen target, its wielder gets tactical advantage on the attack roll and a hit does an additional 6d8 radiant damage.