The Warding of Witch World (Secrets of the Witch World #3)

It is a desperate time in Witch World. The
Magestone, the key to the pandimensional gates, has been lost and now all the
gates are open.
In the classic series' grand finale, an infinite flood of evil is about to wash
across the world as Simon Tregarth returns to lead the planet's heroes in the
final war against the forces of darkness.