Thinking about them (Kile and Farilane in the world where she lived. They find happiness in each other and they change the empire and the world for the better, creating a true golden age. He loves her even as she grows old and he doesn’t, a thousand years that are the rest of her lifetime and barely a blink of his. She dies eventually and goes to the only place he can never follow, and in her wake the world they built slowly falls apart. Kile doesn’t know if he can fix it)

Thinking about Farikile and that quote 'A hero would sacrifice you to save the world but a villain would sacrifice the world to save you' because they ARE the first part of that. Kile sacrificed Farilane to save the world. That should make him the hero. But he still refuses to take the feather. He doesn't believe he's done something good.