Horn of Blasting
Wondrous item, instrument (horn), rare
You can take a Magic action to blow the horn, which emits a thunderous blast in a 30-foot Cone that is audible out to 600 feet. Each creature in the Cone makes a DC 15 Constitution saving throw. On a failed save, a creature takes dice:5d8|noform|noparens|avg (5d8) Thunder damage and has the Deafened condition for 1 minute. On a successful save, a creature takes half as much damage only. Glass or crystal objects in the Cone that aren’t being worn or carried take dice:10d8|noform|noparens|avg (10d8) Thunder damage.
Each use of the horn’s magic has a 20 percent chance of causing the horn to explode. The explosion deals dice:10d6|noform|noparens|avg (10d6) Force damage to the user and destroys the horn.
Source: Dungeon Master’s Guide (2024) p. 270. Available in the SRD and the Free Rules (2024)