Bow of the Cobra (Patreon)

Weapon (any bow), rare (requires attunement)

This metallic bow resembles the shape of a mighty cobra and is covered in spots of patina. When you fire an arrow from the bow, you can choose to coat the arrow in a thin layer of acid. A target hit with the acid-coated arrow takes an extra 1d4 acid damage. Hit or miss, a nonmagical coated arrow is destroyed after the attack.

In addition, the bow has 4 charges and regains 1d4 expended charges daily at dawn. When you take the Attack action using this bow, you can expend 1 of its charges to replace one of your weapon attacks with a special attack. This special attack duplicates the effect of the acid arrow spell and uses the same attack bonus as your normal weapon attacks with the bow.

"I could've sworn that arrow made a hissing sound as it flew by."