The Dying Will Bullet (死ぬ気弾, Shinuki Dan) is a special weapon created by the Vongola Famiglia. It is made by burying prime bullets in Leon's body for three days. Once it makes contact with a person, they die. If they feel regret when they were shot (with an actual bullet, as in the manga, or with a form of energy, as in the anime), they are reborn with a flame on their forehead. When reborn, the person loses their clothes (besides their underwear) and are capable of amazing feats. This state is called Dying Will Mode. In the Varia Arc, Tsuna is trained to control the energy of the Dying Will Bullet by maintaining Dying Will Mode for longer than the 5 minute limit. As a result of this training, Tsuna is able to go into Hyper Dying Will Mode when shot with a Dying Will Bullet.