The Marches be a vast sea of grass dividing the civilized parts of The Land.
Corvis is a western region of The Land, comprising several small counties. It is a magical place, filled filled with fruitful farms, green rolling hills, low stone walls built up over centuries, and a number of small forests. The people are happy and content. It is an ideal place.
Most of the time. And it depends on what you think is ideal…
The players encounter an organization dedicated to toppling tyrannous governments; both good and evil. Secretly, they are led by the twin daughters of Lucifer / The Lightbringer / (Generic Adversary God). These daughters have an appropriate set of divine or demonic powers, but strictly speaking, are not evil.