Source: The Book of Many Things

Weapon (any bow), rare (requires attunement)

This silver-and-black bow is engraved with the phases of the moon. You gain a +1 bonus to attack and damage rolls made with this magic weapon.

When you hit with a ranged attack roll using this magic bow, the target takes an extra 1d6 radiant damage. If you load no ammunition in the weapon, it produces its own, automatically creating one piece of magic ammunition when you make a ranged attack with it. The ammunition created by the bow vanishes the instant after it hits or misses a target.

While wielding this magic bow, you can use a bonus action to enter a semi-incorporeal state until the start of your next turn. While semi-incorporeal, you have resistance to bludgeoning, piercing, and slashing damage. Once this bonus action is used, it can’t be used again until the next dawn.