As a reaction, which you take when you are hit by an attack or taking radiant damage, light wreaths 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.
On a failed save, it takes 1d10 radiant damage and it is blinded until the end of its next turn.
On a successful save, a creature takes half as much damage and isn’t blinded.
You can increase the damage by 2d10 for each additional mana or psi expended.