Crown of the Dragon King

+2 to AC, Spell Save DC, and Spell attack
bonus. While attuned to this item you may cast Command as a 9th level spell at will.
The Last Argument of Kings - As an action you
release a massive wave of burning energy. Every creature in a 60 foot cone must make a Dexterity saving throw, taking 5d10 fire damage, 5d10
radiant, and 5d10 force damage on a failed save
or half as much on a success. You may use this
ability a number of times equal to your Constitution modifier.