Weapon (longbow) Very Rare (10.000 gp)
When you knock an arrow on this bow, you can whisper its command word to swear an oath of enmity against a creature you can see. You have advantage on attack rolls against that creature, and it takes an extra 3d6 piercing damage on a hit. The effect lasts until the target drops to 0 hit points or you finish a long rest. This ability can’t be used again until the next dawn.