With a spiraling gesture of your hand and a forceful exhalation, you create a brief but fierce (90 mph) blast of wind. This spell functions as [_gust of wind_](/spells/gust-of-wind), except all creatures within the area are treated as though they were one size category smaller for the purpose of determining how the spell affects them. For every 4 caster levels beyond 7th, creatures in the area are treated as an additional size category smaller (to a maximum of three size categories smaller at 15th level).