Flintlock
Pro Adventurer
You're counting XI and XIV, while I was counting XIII-2 and Lightning Returns, which are, of course, in the same setting as XIII, which is futuristic.
That leaves X and XII from the games you mentioned. I feel like X's society is more advanced than VI's but it's not so obvious because of how limited the use of Machina is. Look at (old) Zanarkand, for example. I can see the south-east Asian similarity though. I liked that it was a colourful game; we haven't seen that in a while either. I guess XII is fairly medieval.
That leaves X and XII from the games you mentioned. I feel like X's society is more advanced than VI's but it's not so obvious because of how limited the use of Machina is. Look at (old) Zanarkand, for example. I can see the south-east Asian similarity though. I liked that it was a colourful game; we haven't seen that in a while either. I guess XII is fairly medieval.