Azula's Belt

This is a belt of charred, maroon leather. The buckle is made of black, glass-like stone with a dragon’s head engraved in it. It feels warm to the touch. As a bonus action, you can envelope yourself in an aura of flame that deals 5 fire damage to all creatures that end their turn within 5 feet of you, including yourself. The belt holds 10 charges, expends 1 charge at the end of your turn while active, and regains all charges at dawn. As an action, you can release all the energy left in the belt in a fiery nova. This deals 5 times the number of charges remaining in the belt plus 10 fire damage to all creatures within 10 feet of you, including yourself. Creatures caught in the blast can attempt a DC 15 Dexterity saving throw to take half damage. The item must have charges remaining to perform this action, and it consumes all remaining charges. The aura of flame ends when the item runs out of charges or you drop unconscious. You cannot remove the belt while the aura is active