The aftermath of Episode Ignis alternate ending isn't as happy as it first seems. As time goes on more and more darkness gathers around Ignis. Strange things start to happen around him, and most importantly he no longer ages. Whether Noctis ends up having to kill Ignis, or Ignis has to live thousands of years without Noctis until a new Chosen King of Light is born is up to you. I just want to see the "good" ending turn out to be a bad ending