Blazing Malestrom

As you raise your arm into the sky, a bright beam of fire descends from the sky. As the beam reaches the ground, a firey Malestrom forms.

All creatures in a 40ft vertical cylinder with a 10ft radius make a dexterity saving throw, taking 4d8 Fire and Radiant damage on a failed saving throw, or half as much on a successful one.

Using a Higher-Level Spell Slot. The Fire damage and the Radiant damage increase by 1d8 for each spell slot level above 6.