Ring of Fire p. 55
Desert Wind [Fire]
You move in a blur, your feet wreathed in flaming energy. As you run, you leave a trail of fire behind you. You encircle a foe, and the ring of fire you leave behind bursts into an inferno that engulfs your enemy and everything else in the area.
As part of this maneuver, you can moveup to two times your speed along the ground. All of your movement must be along continuous, solid ground. You leave a trail of flames in your wake. These flames have no effect unless they form a closed area. In this case, a raging inferno erupts within that area. All creatures within the area take 12d6 points of fire damage, with a Reflex save (DC 16 + your Wis modifier) for half damage.
The inferno erupts the first time you form a closed area. You cannot create multiple areas in one move.
You are immune to the fire damage dealt by a ring of fire you initiated.
This maneuver is a supernatural ability.