This is ammunition for a ballistae. Near the end of the bolt is a sealed glass tube 6" long 1.5" radius. The tube is filled with glass shards. At the end of the bolt, the arrowhead is a small, pointed iron rod slides inside a sleeve. The pointed end of the rod rests against the glass tube. When the bolt hits its target, the arrowhead compresses, and the rod breaks the tube. When the tube breaks, the compressed air inside the tube causes it to explode showering a 10' radius area with glass shrapnel. All within the radius must roll a DC 16 Dex save or take 2d10 piercing damage (save for half). The air inside the tube is compressed via the Create Air spell--which compresses 15 cubic feet of air into the 6" long tube. An armed bolt (one upon which the Create Air has already been cast) must be handled with great caution as the glass tube tends to be blown by hand under very low quality tolerances. Casting the Create Air spell upon an unarmed bolt has a 2 in 20 chance of exploding the round due to minute cracks in the tube caused by neglect or mishandling during shipment and/or manufacture.
Proficiency with a Heavy Crossbow allows you to add your proficiency bonus to the attack roll for any attack you make with it.
This weapon has the following mastery property. To use this property, you must have a feature that lets you use it.
Push. If you hit a creature with this weapon, you can push the creature up to 10 feet straight away from yourself if it is Large or smaller.
Notes: Ammunition, Heavy, Loading, Range, Two-Handed, Push
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