At the climax of the battle, both Itachi and Sasuke run out of chakra. However, Sasuke reveals that his actions up until now were only a preparation for his final jutsu.
This is Orochimaru's
Eight-Headed Serpent Jutsu.
هذه تقنيّة أوروتشيمارو، الثّعبان ثماني الرُّؤوس
Esta es la técnica de la Serpiente 
de Ocho Cabezas de Orochimaru.
Sembra la Tecnica degli Otto Serpenti
di Orochimaru.
Esse é o Jutsu da Serpente de 
Oito Cabeças do Orochimaru.
Техника восьмиглавой змеи Оротимару.