THE PLOT OF FALLING KINGDOMS
The main idea in this series is that there are magical stones/orbs/crystals which each hold one of the main elements (or elementia magic, as they call it): air, water, earth and fire. These four elements created the world, but after a series of events were lost, their powers no longer sustaining the earth. Without them, both the world that Magnus, Lucia, Jonas and Cleo live in, and the Sanctuary where the immortal Watchers live, are falling apart. Once found, the crystals will either heal the world, or destroy it, depending on those wielding its magic.
