Exactly.
This way I can build the world and adapt the character and gameplay towards to what I want for the protagonist.
Ex: Aeolos has to hunt and fish like a hunter to keep his diet and body strong.
This won't be necessary for the protagonist of the second game, that will have access to good food in the army, specially when he rises through the ranks.
So, obviously, I'll have to develop new ways for him to become stronger.
Calling tutors, philosophers and teachers from around the world to give him a boost at something.
A way of life completely different from Aeolos.
Each Era will remake itself to keep things new and interesting.