Ethereal Blast

You create a disruption in the ether that erupts in a 30-foot cone from your outstretched hand. Each creature in the cone takes 6d6 radiant damage and 3d6 cold damage, or half damage with a successful Constitution saving throw.

Enhancement: For each spell slot used higher than 5th level, the spell does an additional 1d6 damage. You choose whether the extra dice do radiant damage, cold damage, or a mix of both.