You can bring your anger to the surface and manifest it in the terrible fury of the sun’s power,
Prerequisites: Born Under a High Sun, Power Attack, character level 6th.
Benefit: Your bonus to save against fire effects increases to +4. Once per day as a swift action, you may call forth the anger of the sun to immolate one of your weapons. Your weapon gains the properties of a flaming weapon for a number of rounds equal to your Charisma modifier (minimum 1). Projectile weapons bestow this property on their ammunition.
Source: Dragon Magazine #340 (Page 48)