DragonSword. Return of the Dragonriders, #3

Only the Gift of the Volcano, born in darkness and fire, can give them the strength they need to conquer fear and fight the mightiest of the Nightmare Legion. Noren has just narrowly escaped burning alive. Reunited at last, he and Silmavalien flee northwards, while trying to figure out what their relationship is now, after the ways they've both failed. While he and Elninya recover from their recent ordeal, they are joined by Onyxalis, a mysterious obsidian dragon hatchling, who claims to be the destined Avenger of the Dragons. The hordes of the nightmare are gathering, and the very earth is suffering.
It is time for the Dragon-sword to burn again, but the only place its fire can be re-kindled or that Onyxalis can gain the power he needs as the Obsidian Guardian, is the Volcano of Ellen Island. Even as they journey towards fire, an icy fear tightens around Silmavalien's heart. Can the Volcano give her, too, the assurance she needs for the battle before her? Contains over 15 illustrations by the author.