Dnd: The gates of Lunara city

This is the world of Hethersfall home of 5 separate kingdoms then used to form one empire 20 years ago there was a war that last for 30 years a war against the empire the emperor lost. After the war the empire was confined to 5 towns including the capital Lunara city a city of mystery now the world is at peace but for how long. Ps this is DND inspired and my not be the same as DND beyond or BG3