As an action, a creature that you can touch or see within 18 meters becomes filled with intense magical light as the light bursts from its wounds and orifices. The creature must succeed on a Fortitude saving throw or it is blinded and radiates bright light in a 6-meters radius and dim light for an additional 6 meters for the duration.
At the end of each of its turns while affected by this spell, the creature must make a Fortitude saving throw.
On a failed save, the creature takes 7d6 radiant damage.
On a successful save, the creature takes half as much damage and the spell ends. Undead and oozes have disadvantage on this saving throw.
You can increase the damage by 5d6 for each additional mana or psi expended.