Cosmic Flare

Using your own body and soul as magical reactor, you amplify and magnify the magical energies building within you, then release them as beam of awe-inspiring destructive power. As you begin casting this spell, immediately end your turn. You are unable to use a reaction or bonus action the turn you begin activating this spell as you focus completely on the charging process. On your next turn, as an action you can release the energy forming a line 150 ft long and 15 ft wide. Each creature within the line must make a constitution saving throw. A creature takes 15d10 force and 15d10 lightning damage on a failed save or half as much on a successful one. Any creatures that die as a result of this spell are reduced to dust along with any non magical items they were carrying. If you choose not to release the spell you still expend a spell slot.