Horn of blasting

The horn of blasting appears to be a normal trumpet and can be sounded as a normal horn, but if the correct word is spoken and the instrument is then played, it has the following effects, both of which happen at once. First, a cone of sound, 120 feet long and 3 feet wide at the end, issues from the horn. All within this area are stunned for a short time and deafened for bit longer, and may sustain physical damage. Second, a wave of ultrasonic sound 1 foot wide and 100 feet long issues from the horn. This causes a weakening of materials such as metal, stone and wood. If a horn of blasting is used magically more than once a day, there is a chance that it will explode.

Note: This version of the horn of blasting originally appeared in the 2nd Edition Dungeon Master Guide for the Advanced Dungeons & Dragons game by TSR. Their inclusion here is for the purposes of providing context for the campaign only.