A minor explosive spirit enters you and takes hold of your soul. You gain vulnerability to fire damage when you take this feat. When you reach zero HP via fire damage, you can choose to immediately fail two death saving throws to deal 4d10 fire damage to all creatures within a 20 foot radius, centered on you. This damage becomes 6d10 at level 6, 8d10 at level 11, and 10d10 at level 16. Once you use this feature, you cannot use it again until you finish a long rest.