It depends on how big the nation was, if there were others beyond the city that they lived in. Since the elementals wiped it clean, we're not sure of any outlying villages/towns that they could have been in, where the main hub was the bigger city. Afaik it's vague on how many actually fought to Diabolos, beyond it took a lot of them to seal him and his rampage. I'm likely mistaken, but I'll see if I can dig up on whether or not it was said that some actually fled the city and made their way elsewhere - I thought that was said, but I want to make sure I'm not remembering info incorrectly. :/a
