Fire Release: Supernova (RobonUzumaki)

After entering his youth form, Sakebu holds a miniature-sun as he calls it, in his hand. The technique is really called Fire Release: Supernova. When the ball is thrown or impacted into someone or an object, it will explode, leaving tons of damage. However, despite it not seeming so, the technique is very wearing on the body, causing some stress.