Stormed Fortress. Janny Wurts. 2007.

Wars of Light and Shadow Volume 8
Fifth Book of the Alliance of Light

Though Athera may be free, the fight is far from over…

The heartstopping conclusion to the Alliance of Light series brings Lysaer's army of Light to besiege the great citadel of Alestron. Master of Shadow, Arithon, with barely a moment to recuperate from his victory over the necromancers, has discovered that young Jeynsa s Valerient, whom he has sworn to protect, has joined the ranks of his disowned allies within the threatened citadel. Worse, following a failed rescue attempt, his beloved Elaira, his double, Fionn Areth, and the spellbinder Dakar are also trapped within Alestron's walls. The chancy wiles of Davien the Betrayer must spirit Arithon across the enemy lines to attempt a bold and perilous rescue mission.

Arithon must seek the heartcore of his talent, even while embroiled in a savage battle against those he has vowed to protect. But treachery strikes trom deep within the duke's ranks. Lysaer's fanatics will be unleashed to claim their bloody revenge. With the Fellowship Sorcerers in mortal danger, and all under threat from a collapsing grimward, Davien the Betrayer is unable to intercede to save his colleagues and so will be forced to invoke the dire terms of an ancient and most secretive bargain.

Arithon stands alone at the hour of reckoning as the true purpose of the Koriani enchantresses becomes fully unveiled at long last...