Adrestia

Adrestia, officially the Adrestian Empire (アドラステア帝国, Adorasutea-teikoku) is one of three nations on the continent of Fódlan.

In When the Cold Breeze Blows Away, they are first appeared in during the USRAC War that they would be lead by Empress Edelgard von Hresvelg but they also join the New Central Powers due to signed their treaty and co-operate with Leicester Alliance and Faeghus to have their revenge on against the Grand Alliance.

And therefore, Empress Edelgard and her allies would have new friends who came from each nations who joined the New Central Powers in during the USRAC War and later it was merged with two nations into the united alliance of Fodlan.