As an action, you can engulf a creature’s eyes or ears in shadow, blinding or deafening it. Choose one creature that you can touch or see within 18 meters to make a Fortitude saving throw.
On a failed save, a creature takes 2d10 necrotic damage and is either blinded or deafened (your choice) for the duration.
On a successful save, the creature takes half as much damage and isn’t blinded or deafened.
A 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 4d10 for each additional mana or psi expended.