El poder de Tenebrosa (Los dragones de Nalsara, 6)

To protect the dragons from the fearsome magic of the addraks, Cham and Nyne travel to the Black Fortress to seize Tenebrosa, the fabulous sword of their grandfather Eddhor. But the sorcerer Darkat has no intention of letting the young dragon rider and the little mage leave alive. A final, epic battle awaits Cham, Nyne, and the dragons to save the kingdom of Nalsara...