As a reaction, which you use when you are hit by an attack or missed by 4 or less or taking radiant damage, light wreaths your body, shedding bright light in a 2-meter radius and dim light for an additional 2 meters. If the creature who damaged you is within 10 meters, it must make a Fortitude saving throw.

On a failure, it takes 1d6 radiant damage and is blinded until the end of its next turn.

On a critical failure, it takes twice as much damage.

On a success, it takes half as much damage.

On a critical success, it takes no damage.

Augment

You can increase the damage by 3d6 for each additional mana expended.