Gravenwood The Conjurer Fellstone Book Two

After an appeal to the Conjurer Lord Queshire of Blackgrove to help cure Tessa's mother, the lord takes Calder hostage and demands Tessa and Ash bring him the Gravenwood, a magical wooden tablet owned by the ruling family of neighboring Fairlace, now headed by Tessa's uncle, Mace Eldred and his wife, Odelia Catwick. But our heroes have no idea how they will steal it. No one has ever managed the feat before, despite that many covet the Gravenwood's unique power, which can make its owner invincible.