Lords of the Shadows (Raven, No 4)

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Summary: Raven Swordsmistress Volume 4
Review: From back of book:
Raven- Out of the bonds of slavery arose a beautiful warrior....Feared across the land, her blade was stained with the blood of thousands.....
Raven- With her mysterious companion-mentor, Spellbinder, and a great black bird to watch over them, she was invincible. Together they would face the savage butchery of battle and the gathering forces of evil.
Raven- The Wall of Thought, barrier against the unknown, has been breached. Now the Ghost Lords of Uthganaar roam free. half man and half beast, they have united an evil people to conquer the world!Only a mabion blade, a sword that defies magic, is potent against an army from Hell. And only a warrior such as Raven can hope to possess such a treacherous weapon....