As a reaction, which you take when you are hit by an attack, wispy flames wreath your body, shedding bright light in a 3-meters radius and dim light for an additional 3 meters.
If the creature who damaged you is within 18 meters it must make a Fortitude saving throw as it is surrounded by flames.
On a failed save, the creature takes 2d6 fire damage and is burning 1.
On a successful save, it takes half as much damage and doesn’t start burning.
You can increase the damage by 3d6 and the burning level by 1 for each additional mana or psi expended.