Blinding Weapon

You touch one weapon. For the duration, when the weapon hits a target for the first time, the target must make a constitution saving throw (vs your spell DC) or become blinded for 1d4 rounds.

At Higher Levels. When you cast this spell using a 3rd level spell slot, you may touch two weapons; 5th level, you may touch three weapons; 7th level, you may touch four weapons; 9th level, you may touch five weapons. Additionally, when cast using a spell slot of 5th, 7th, or 9th level, the spell's duration is 1 minute.