Remora.Sephirus said:
I don´t wanna change back to sand after, and i want to keep doing the WOTG missions.
So the direct question is: If i move to windurst nation i will be on same WOTG mission that i am on Sandoria ?
Yes you will, since it's not a mission, it's a quest. Each nation has their own quest line.
Also, you won't lose two medals switching nations. The only time you lose two medals is if you switch nations, then switch back to a nation you already were affiliated with.
Edit: I don't know if you meant you'd be at the same point in the quest line for Windurst when you switch over, or just keep your Sandy progress. You keep your Sandy progress (since it's a quest line), you don't get bumped up for Windurst.