Ring of Reflection

Wondrous item (ring), very rare (requires attunement)

This ring features a stunningly large diamond that reflects every photon that touches it directly into the eyes of your enemies.

Upon taking lightning or radiant damage you can use your reaction to gain resistance to the incoming damage. Additionally, choose one creature within 120 feet to make a Constitution saving throw with a DC equal to half the incoming damage.  On a failure, they are blinded. They can repeat this saving throw at the end of each of their turns. It lasts for 1 hour or until they succeed.