What is the setting in the novel, The Darkangel?

The moon has long ago been settled and then abandoned by people from the earth. They created an atmosphere so they could breathe on the moon's surface, and left behind races of people and creatures, as well as plants and languages. The current inhabitants of the moon have legends of the earthpeople, whom they call the Old Ones, but no one remembers the events that led to their departure from the planet.

Just as the moon hangs above earth in the sky, the earth, which is called Oceanus, shines down on the moon.

Solstar, the sun, shines in the distance.

Time is measured in day-months, where a month of light is followed by a month of darkness.

The two main places of action are the vampire's castle and the surrounding desert. The castle is cold and lifeless, inhabited only by the vampire and the wraiths, his wives. The gargoyles stand guard outside. Life and warmth characterize the desert, which is full of helpful creatures and people, such as the lion Pendarlon and the nomadic Ma'a-mbai tribe.