Dragonlance: Dragons of Spring Dawning Series by Margaret Weis, Tracy Hickman

The Dark Queen's dragon armies are on the move, conquering all who oppose them. The land of Ansalon is about to disappear into darkness forever. But a new leader has arisen. As the Golden General leads the forces of good to war, the companions must fight their own battles. Some will rise, some will fall, all in one last, desperate attempt to keep light from departing the world forever.

As the Companions stand on the threshold of victory against the Queen of Darkness, they find themselves at risk of losing everything they have fought for when a new darkness surfaces from within, testing their alliance and faith.