A beam of brilliant laser light flashes out of your diamond eyes in a 5-foot-wide, 60 foot-long line.  Each creature in the line must make a Constitution saving throw.  On a failed save, a creature takes 6d8 radiant damage and is blinded until you next turn.  On a successful save it takes half as much damage and is not blinded by this spell.  Undead and oozes have disadvantage on this saving throw.  For every spell level above 4th, damages increases by 1d8, or range increase by 60 ft, casters choice.