Fireball

The damage dealt increases to 1d10 points of fire damage per caster level (maximum 10d10). Any creature that fails its Reflex saving throw catches on fire, taking 2d6 points of fire damage each round until the fire is extinguished. Attempts to extinguish this fire use the spell's save DC.

Augmented (6th): If you expend two uses of mythic power, the maximum damage increases to 20d10, the area increases to a 40-foot radius spread, and any fire damage dealt by the spell bypasses fire resistance and fire immunity.