Implement of Cruelty

A weapon is not evil unless wielded with evil intent.
You imbue the weapon you are wielding with a crude sentience marked by a terrible and infectious bloodlust. During your turn when you hit a creature with the weapon, you can make an additional attack targeting the same creature. If this additional attack misses, the target of your attack can use their reaction to make an opportunity attack targeting a creature within their reach. If you fail to inflict damage using this weapon during your turn, or if the weapon leaves your possession, the spell ends.