As an action, you blind the eyes of a creature that you can touch or see within 10 meters with radiant light. The creature must make a Fortitude saving throw.
On a failure, it takes 2d8 radiant damage and is blinded for the duration.
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.
The creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
You can increase the damage by 4d8 for each additional mana expended.