Death Flame

Shadowy-golden flames emanates from your eyes, surging around your entire body.

After concentrating the flames into the palm of your hand, you shoot a wave of Death Flame before you. Each creature in a 75-foot Cone makes a Dexterity & Constitution saving throw, taking 10d6 fire damage plus 10d6 necrotic damage on a failed save or half as much damage on a successful one, respectively.
All creatures affected by the initial wave will burn for a subsequent 6 turns. Each creature must make a Dexterity & Constitution saving throw every turn, taking 5d6 fire damage plus 5d6 necrotic damage on a failed save or half as much damage on a successful one, respectively.

These attacks ignore immunity to fire and necrotic damage and instead treats immunity as resistance.

A creature that dies to this spell has their body, mind, and soul irreversibly disintegrated, leaving nothing but a shadowy ash. Objects in the Cone that aren’t being worn or carried are disintegrated.