You can throw this stone as a ranged attack with a range increment of 20 feet. When it strikes a hard surface (or is struck hard), it creates a deafening bang that is treated as a sonic attack. Each creature within a
10-foot-radius spread must make a DC 15 Fortitude save or
be deafened for 1 hour. A deafened creature, in addition to
the obvious effects, takes a –4 penalty on initiative and has
a 20% chance to miscast and lose any spell with a verbal
component that it tries to cast.
Since you don’t need to hit a specific target, you can
simply aim at a particular 5-foot square. Treat the target
square as AC 5.
Cost: 30 gp.
Weight: 1 lbs