Babrov's Baffling Bardiche

A bardiche manifests from you and dazzles an enemy of your choice that you can see within range. The target must make a Charisma saving throw or take 5d10 radiant damage and be blinded. It may repeat this saving throw at the end of each of its turns. If it makes the saving throw, it takes half of the damage and isn't blinded. In addition, a thunderous "Wow!" is audible out to 150 feet and the area 5 ft. around the target glows with dim light for 1 minute.