Comet Bow (5e Equipment)
From D&D Wiki
Weapon (longbow), very rare
This enchanted, wooden longbow has a bright blue beam of magical energy in place of a bowstring. This magical bowstring shimmers and glows faintly, but not enough to produce a significant amount of light. Drawing the magical bowstring is no different than drawing a normal bowstring on a mundane longbow.
Magic Weapon. You have a +2 bonus to attack and damage rolls made with this weapon.
Comet Shot. Any arrows fired from this weapon transform into streaking bolts of bright blue magical energy and deal force damage instead of the piercing damage normal for a longbow. As a result, any ammunition fired from this weapon cannot be recovered.