Leilan Artifice

This silver contraption bears a slight resemblance to a crossbow but is stockier—it has a handle and trigger, then instead of a sliding stock there’s a slot two inches across and one wide. A fat barrel covered in countless divine symbols protrudes parallel from the top of the handle, with a hollow opening at the far end from the stock.

This weapon is known by a few other names— sunbuster, dayslinger, sungun—and is thought to be the only one of its kind. When filled with a crystal of distilled sunlight (page 234) and fired, the shining ammunition is transformed into sound. If you are proficient with any type of crossbow you are proficient with this weapon.

The Leilan Artifice has a range of 50/150 feet, the loading property (each crystal of distilled sunlight is enough for 4 shots), and on a hit it deals thunder damage equal to 1d8 + your Dexterity modifier. On a successful ranged weapon attack against an undead , this weapon deals an extra 1d6 radiant damage. While you are attuned to this weapon, on your turn you can use an action to hold the trigger for a burst shot.

Burst Shot. Choose a creature or object within 100 feet and make a ranged weapon attack against it. On a hit, you deal thunder damage equal to 4d12 + your Dexterity modifier. Each creature in front of or behind your target and within 100 feet of you makes a Dexterity saving throw against a DC equal to the result of your attack roll, taking 2d8 thunder damage on a failure. A burst shot consume half a crystal of distilled sunlight.

Evil and undead creatures take 2d6 radiant damage when touching this weapon and cannot wield it.