Bright Flash

When a creature in melee range makes an attack against the caster, the caster can use their reaction to cast this spell.  The caster closes their eyes and holds their hands in front of their face.  A bright light flashes in front of the creature making the attack.  The creature must make a constitution saving throw.  If it fails, the creature is blinded until the end of its next turn.  On a success, the spell fails.

This spell is only effective against creatures that use visual means of sight.  If the creature does not have optical sight, the spell will have no effect.