Horn of Blasting 5e
Wondrous Item, rare
You can use an action to speak the horn's command word and then blow the horn, which emits a thunderous blast in a 30-foot cone that is audible 600 feet away. Each creature in the cone must make a DC 15 Constitution saving throw. On a failed save, a creature takes 5d6 thunder damage and is deafened for 1 minute. On a successful save, a creature takes half as much damage and isn't deafened. Creatures and objects made of glass or crystal have disadvantage on the saving throw and take 10d6 thunder damage instead of 5d6.
Each use of the horn's magic has a 20 percent chance of causing the horn to explode. The explosion deals 10d6 fire damage to the blower and destroys the horn.
Commentary by Sam West, Twitter: @CrierKobold
Sometimes you need a big blast to break your enemies to pieces; a Horn of Blasting is an easy way to get there, but at a tremendous risk. Still, sometimes you’ve got no other options, or are facing a swarm of glass monsters, and in those moments, it’ll (hopefully) work out!
A creature that’s deafened only suffers from automatically failing ability checks that require hearing.
There are almost no creatures outside of Animated Mirrors that are going to have disadvantage on the check and take the bonus damage, but hey, some probably technically exist at this point.
This item has no limitations to uses; you can keep using until it explodes, meaning you could get incredibly lucky and get dozens of uses out of it.
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