Divine Blast

A ball of divine energy shoots out from the caster's hand, towards the point chosen within range. Any creatures within a 15 ft sphere of the chosen point take 6d6 Radiant damage and has to roll a Constitution saving throw. 

On a failed roll, the creature becomes blinded and has to roll again next turn to regain their sight, they will keep doing that until they succeed. On a successful roll the creature takes half damage and does not get blinded.