This ended with Sasuke's encounter with his brother. After battling Itachi, Sasuke realized that he lacked both the strength and intelligence to kill him. Later Sasuke leaves Naruto and Konoha to go to Orochimaru, one of the main antagonists of the series, to learn advanced ninja techniques and to be trained as a stronger ninja. Through mastering “Level Two of the Cursed Seal,” a restricted ninja technique, Sasuke obtains extraordinary power, thanks to is former master. Eventually, Sasuke defeats and kills his older brother only to find out that the order to massacre the Uchiha Clan was made by the elders of Konoha because the clan was destroying the peace of the entire village. However, Itachi could not kill his little brother because he loved Sasuke too much. In order for Sasuke to become able to protect himself, Itachi told Sasuke to live a life of anger and revenge which would stimulate Sasuke’s progress and allow him to become a strong ninja. After hearing about his brother, Sasuke turns his anger toward Konoha and decides to destroy the village.