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This special attack allows a dragon of at least Gargantuan size to sweep with its tail as a standard action. The sweep affects a semi-circle with a radius of 30 feet (or 40 feet for a Colossal dragon), extending from an intersection on the edge of the dragon's space in any direction. Creatures within the sweep area are affected if they are 4 or more size categories smaller than the dragon.
A tail sweep automatically deals the age table indicated damage plus 1.5x dragon's Strength bonus (round down).
Affected creatures can attempt Reflex saves to take half damage (DC equals dragon's breath weapon).
Based on the entry in Dungeons & Dragons Monster Manual 3.5