The Dying Will Flame (死ぬ気の炎, Shinuki no Honoo; Viz: Deathperation Flame) is regarded as the symbol of the Mafia World. At the beginning of the series, it had only minor relevance with the overall plot (mostly through its relation with Reborn's Dying Will Bullet and Tsuna's "resurrected" form). But as the story progressed, it became a more central element and is currently the source of most of the supernatural powers seen in the series.
There are many items in the series that light up and/or use Dying Will Flames for some purpose. Among those, the Rings treasured by the Mafia deserve a special mention due to their long history and importance. In the Future Arc, the Flames of these Rings serve as the power source for the Box Weapons.
The Dying Will Flame is described as high-density form of energy that is refined from one's own life-force.
Due the way how it resonates with one's emotions, it has been regarded as a type of battle aura. However, unlike the aura, which is a supernatural phenomenon that can only be seen by a few individuals, the Dying Will Flame is in many ways more alike to a real flame, possessing even its own destructive properties.
Dying Will Flames are graded accordingly with their purity, which has a direct relationship with the strength of an individual's resolve. Among other things, this rate of purity serves to indicate how much of the special characteristics of the Flames are being drawn out. Each Flame's attribute has its own special characteristic.