Oathbow

Very rare (requires attunement)

When you nock an arrow on this bow, it whispers in Elvish, “Swift defeat to my enemies.” When you use this weapon to make a ranged attack, you can utter or sign the following command words: “Swift death to you who have wronged me.” The target of your attack becomes your sworn enemy until it dies or until dawn 7 days later. You can have only one such sworn enemy at a time. When your sworn enemy dies, you can choose a new one after the next dawn.

When you make a ranged attack roll with this weapon against your sworn enemy, you have Advantage on the roll. In addition, your target gains no benefit from Half Cover or Three-Quarters Cover, and you suffer no Disadvantage due to long range. If the attack hits, your sworn enemy takes an extra dice:3d6|noform|noparens|avg (3d6) Piercing damage.

While your sworn enemy lives, you have Disadvantage on attack rolls with all other weapons.

Variants:

Oath Longbow

Oath Shortbow

Source: Dungeon Master’s Guide (2024) p. 282. Available in the SRD and the Free Rules (2024)