What's outside of Eidolon City? Can my character leave?

As far as your character is concerned, there is a whole world outside Eidolon City. There's things going on, other places, there's even a war overseas. Your character may have relatives living outside the city somewhere, in another town, state or country. But, your character never leaves Eidolon City for one reason or another. The 'why' of that is up to you, but they don't leave, and nobody they know outside the city comes to visit.

Your character may have memories of having left Eidolon City in the past, they may have travelled, or originally lived somewhere else. Likewise, they may have memories of other people from outside the city coming to visit them, but - in game - they never leave and nobody comes to visit.