he speaks the truth "My home is far from this place. On a Human World of Equestria" He said the truth. Rodimus gasps about why Starbreaker returned to Cybertron "I was once a Chronicler. Since 2 years ago when I lost everything to a powerful Siren that is enslaved their people. That is why I must find a way back!" He said, Rodimus shocks about the event "What happened on this place? Where the others, where's Sunset?" Rodimus asked "She… taked by the Dazzlings. I ever saw the people are enslaved. But they killed their friends, and Twilight is missing." Starbreaker asked "Oh no, we have forgotten since 2 years. I have to do something" Rodimus said

From the Darkest Past, from Transformers Equestria Girls: The Friendship Reborn