Glass Cannon (5e Equipment)
From D&D Wiki
Wondrous Item, uncommon
The glass cannon is a weapon created with sand and magic. It is used as an artillery piece in desert battles, where it can be crafted on-site faster than a mundane cannon. It fires a cluster of glass shards which spread out to shred infantry. A glass cannons do not last for long: they are often taken out by enemy catapults before they can fire, or they shatter themselves with their forceful blasts.
Loading the cannon is merely a matter of pouring a bucketful of sand down the barrel, which takes an action or a bonus action. It takes one action to aim the cannon and one action to fire it.
Shredding Shot: The cannon fires glass shards in a 60-foot cone. Each creature in that area must make a DC 15 Dexterity saving throw, taking 7d6 slashing damage on a failed save, or half as much damage on a successful one. The cannon deals 5 slashing damage to itself.