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After the caster threw or fired a single nonmagical missile weapon into the air and picked an area within 150 feet (46 meters), the area would be pelted with a volley of hundreds of the same missiles. The selected area would cover a 40-foot radius (12 meters) and a 20-foot-high cylinder (6.1 meters). If a target was quick enough, they could dodge half of the damage. The damage of the volley was of the same type as the initial missile and the missiles would disappear after landing.
Verbal and somatic components and a missile weapon were the necessary components for the spell to be cast.