Answer is internal, due to the fact that the character in the passage quotes “stuck between my hatred of the empire I served “
I think it is the story of The Labyrinth
It is important to know the author's purpose because knowing the author's purpose can change how the story is being told. If someone said,"Mom, I would really like this new video game for my birthday." and the author's purpose was to inform, it would be informing the mom that the person wanted the video game. If the author's purpose was to persuade, that person would be persuading the mom to get him the video game.