Banner of The Flame

While you are within 5 feet of this banner, you can take a Magic action to light it ablaze once per long rest. When used, the banner ignites into a 10ft aura of a flaming cyclone. Anything upon entering the aura must make a Dexterity saving throw, taking 8d8 Fire damage on a failed save and half as much on a successful one. The banner extinguishes after 10 mins, or when you put it away as a Bonus Action.