Dazzling Blade

You coat the weapon evenly in diamond dust that then melds into it becoming a  lustrous opalescent sheen. When swung in combat the weapon leaves a trail of twinkling motes and sings instead of "whooshing" through the air. Until the spell ends the weapon's attacks flash with a intense flare of scintillating light dealing an extra 1d6 radiant damage to any target you hit with the weapon. If the weapon isn’t magical, it becomes a magic weapon for the spell’s duration.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the charge lasts for up to 8 hours.