Blinding Smite

Casting Time: 1 bonus action
Range: Self
Duration: Concentration, up to 1 minute
The next time you hit a creature with a
melee weapon attack during this spell's duration,
you weapon flares with a bright light, and the
attack deals an extra 3d8 radiant damage to the
target. Additionally, the target must succeed on a Constitution saving throw or be blinded until the
spell ends.
See PHB, pg. 219.