Dnd the ancient war Lost Castle
Deep underground castles and temples can be found from thousands of years ago. Many where destroyed in the first war, but those that remain still hold the secrets of old. Many men died searching for these ancient sites in order to claim the artifacts for themselves.
Hidden far away in the north there is a clan of dragon worshipers (also known as skyflames) that guards a secret about one of the castles. The castle should be somewhere south. Deep in a jungle ruled by an mysterious Fey race that are often described as Wererats. They are well known of defeating even the largest army’s by sheer numbers.