As a standard action, you can surround your body with an
envelope of fiery plasma. You gain cold resistance 10, and
any adjacent creature that hits you with a natural weapon
or a melee weapon takes 2d6 fire damage. The corona lasts
for 1 round or until you leave photon mode. At 12th level, the
damage increases to 3d6 and the cold resistance increases
to 15. At 18th level, the damage increases to 4d6 and the cold
resistance increases to 20.
When you are attuned or fully attuned, any creature that starts its turn adjacent to you while your corona is in effect takes fire damage equal to half your solarian level.