Truth

Madara continues by informing Sasuke that Itachi was a double-agent who was assigned to leak intel on the Uchiha back to the village. He then contacted Madara to help him undertake his mission of exterminating the Uchiha clan. They succeeded in their mission, although Itachi couldn't bring himself to kill Sasuke. Some time later, Sasuke reminisces on Itachi's final words to him, before breaking down into tears. Heartbroken and vengeful, he changes his team's name to Taka and declares that their goal is to destroy Konoha, revealing his newly awakened Mangekyo Sharingan.