Eclipse

You create a sun and moon on either side of yourself. You draw your hands together to merge and culminate a powerful eclipse. Each creature within a 40 foot long/20 foot high cone from yourself, must make a constitution saving throw. On a failure, the creature takes 6d6 radiant damage, and gains a level of exhaustion, on a pass the damage is halved and they dont gain exhaustion. If a creature is looking at you when you cast this spell or during concentration, they are blinded as well if they fail the saving throw. Creatures that are blinded from this spell make the saving throw with disadvantage. The area of the 40 foot cone becomes difficult terrain for flying creatures, and creatures on the ground when cast. 

When this spell is cast at 8th level or higher, the damage goes up by 2d6 for every level higher.