Comet Ballista

Ammo: crossbow bolt

This crossbow is partially covered in cold shards of stone and metal and uses sling bullets as ammunition instead of crossbow bolts. When you fire a sling bullet from this magic crossbow, it flashes with blue light and leaves behind a brief, glimmering trail of cold, sparkling dust. Ranged attacks with this weapon deal bludgeoning damage, instead of piercing damage, and any target hit by it takes an extra 1d6 cold damage. In addition, the first time you hit a target on each of your turns with a ranged attack using this weapon, each creature within 10 feet of the target must succeed on a DC 13 Constitution saving throw or take 1d6 cold damage.

Hailing Comets: You can use an action to fire the crossbow into the air and speak its command word, choosing a point that you can see within 120 feet of you when you do. The sling bullet scatters into icy dust and is destroyed, but magically conjures a barrage of minuscule falling comets above the point. The comets fall in a 20-foot-radius, 40-foot-tall cylinder centered on that point and disappear once they hit the ground. Each creature within the area must make a DC 13 Dexterity saving throw, taking 8d6 cold damage on a failed save, or half as much damage on a successful one. Once this property has been used, it can't be used again until the next dawn.

Ammunition: You can use a weapon that has the ammunition property to make a ranged attack only if you have ammunition to fire from the weapon. Each time you attack with the weapon, you expend one piece of ammunition. The ammunition of a firearm is destroyed upon use. Drawing the ammunition from a quiver, case, or other container is part of the attack (you need a free hand to load a one-handed weapon). At the end of the battle, you can recover half your expended ammunition by taking a minute to search the battlefield. If you use a weapon that has the ammunition property to make a melee attack, you treat the weapon as an improvised weapon (see "Improvised Weapons").

Range: A weapon that can be used to make a ranged attack has a range shown in parentheses after the ammunition or thrown property. The range lists two numbers. The first is the weapon's normal range in feet, and the second indicates the weapon's maximum range. When attacking a target beyond normal range, you have disadvantage on the attack roll. You can't attack a target beyond the weapon's long range.

Loading: Because of the time required to load this weapon, you can fire only one piece of ammunition from it when you use an action, bonus action, or reaction to fire it, regardless of the number of attacks you can normally make.

Two-Handed: This weapon requires two hands when you attack with it.

Heavy: Creatures that are Small or Tiny have disadvantage on attack rolls with heavy weapons. A heavy weapon's size and bulk make it too large for a Small or Tiny creature to use effectively.