The Fallen Age was the period after the Dark Wars. Both the Dark Union and the Order of the Flame had been utterly destroyed. The forces of the Union had been scattered to the corners of the world, while the few remaining dragons of the Order had fallen into stone slumber after their Bonded perished in battle.
Most human cities and kingdoms were destroyed, leaving only scattered villages and tribes. They were so scattered, every village had to fend for itself, leaving it at risk to attack from grulls, wartoks, and feral dragons. With no light to guide them, humanity fell into a dark age.
Drakan: Order of the Flame - Drakan: The Ancients' Gates