Blinding Bolt

You blast a creature with an excess amount of Primordial Light. Make a Ranged Spell Attack against the target. On a hit, it takes 3d8 Radiant damage and has to make a Constitution saving throw or be Blinded for 1 minute. The creature repeats the saving throw at the end of it’s turn, ending the condition on itself on a success.

Using a Higher-Level Spell Slot. The damage increases by 1d8 for each spell slot level above 2.