3e SRD:Thunderstone

Throw this stone as a grenadelike weapon. When it strikes a hard surface (or is struck hard), it creates a deafening bang (a sonic attack). Creatures within a 10-foot radius must make Fortitude saves (DC 15) or be deafened. Deaf creatures, in addition to the obvious effects, suffer a -4 penalty on initiative and a 20% chance to miscast and lose any spell with a verbal (V) component that they try to cast.

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