From Pathfinder Core Rulebook, which isn't enabled.

Horn of Blasting

ITEM 9

Price 700 gp

Usage held in 1 hand

Bulk L

A horn of blasting is a bright brass trumpet. It can be played as an instrument, granting a +2 item bonus to your Performance check.

Activate Interact

Frequency once per round

Effect Blowing into the horn with destructive intent, you create a blast note targeting one creature within 30 feet. The blast deals 3d6 sonic damage (DC 28 basic Fortitude save).

Activate Interact

Frequency once per day

Effect You blow even louder to create an intense blast wave in a 30-foot cone that deals 8d6 sonic damage. Each creature attempts a DC 28 Fortitude save with the following effects.

Critical Success The creature takes no damage.

Success The creature takes half damage.

Failure The creature takes full damage and is Deafened for 2d6 rounds.

Pathfinder Core RulebookOGL