Stormvoice
From Ardrana
The stormvoice spell enables the caster to speak with the voice of a storm. The caster can be heard clearly at ten times normal distance. The voice produced is powerful enough to deafen or knock down less hardy creatures.
This spell originally appeared in this form in Powers and Pantheons for the AD&D game from TSR. Its use here is for the purposes of providing context for the campaign only.