Wyrm's Flame p. 56

Desert Wind [Fire]

Level: Swordsage 8
Prerequisite: 3 Desert Wind maneuvers
Initiation Action: 1 standard action
Range: 30 ft.
Area: Cone
Duration: Instantaneous
Saving throw: Reflex half

You spin your blade in a whirling arc. With each revolution, seething flames build upon its length. With a flourish, you bring your blade to a halt, point it at your foe, and unleash a roaring wall of flame.

Masters of the Desert Wind can twirl and spin their blades with such power that they can evoke a great burst of fire. When you execute this maneuver, you blast forth a cone of fire that deals 10d6 points of fire damage to all in its area. Creatures in the area can attempt a Reflex save (DC 18 + your Wis modifier) for half damage.

This maneuver is a supernatural ability.