The Black Kings Curse

A bright streak flashes from you to a point that you start gathering energy from all of the planes, absorbing life and death as if the eternal fire, there is gathering of the havens, the hells , the astral planes for the first action. The next action the heart and eyes of the user glows and explodes. Not harming him but harming his enemies in one move. Each creature in the room makes a Dexterity saving throw, taking 8d6+25 Fire damage on a failed save or only 8d4 as much damage on a successful one.

There is no effect afterwards .

Using a Higher-Level Spell Slot. The damage increases by 1d6 for each spell slot level above 8.