It is eventually revealed to Sora that within him lies the destiny to save Roxas, Naminé, Xion, Axel, Terra, Ventus and Aqua from their suffering. Sora thanks Naminé as Mickey returns to the real world, creating a letter to inform the real Sora of what he has learned.
You may now rage freely
Sieg Milites!!!! Battle Cry of Miltes, FF Agito XIII