Horn of Blasting
This adamantine-trimmed hunting horn unleashes a powerful blast of thunder when blown.
Wondrous Item 65,000 gp
Power (Thunder) Daily (Standard Action)
When you sound the horn, make an attack: Close blast 5; +19 vs. Fortitude; on a hit, the target takes 2d10 thunder damage and is dazed and deafened until the end of your next turn; on a miss, the target takes half damage and is deafened until the end of your next turn. On a critical hit, the target is also pushed 1 square and knocked prone.
Published in Adventurer's Vault, page(s) 173.