Siege of stone: Sister of darkness - Terry Goodkind (The Nicci Chronicles #3)

The sorceress Nicci, the wizard Nathan Rahl, and the young swordsman Bannon are under siege.

Having liberated the legendary city of Ildakar from the despotic reign of the wizard's council, they now face the council's final act of vengeance: an ancient spell has been revoked and half a million hostile warriors released from the fifteen centuries of stone-bound stasis.

Surrounded, trapped inside the city walls, the companions must stand shoulder-to-shoulder with the newly freed citizenry to repel an ancient foe sworn to the destruction of their city.

But Nicci, a one-time Sister of the Dark, knows that there is more at stake than just Ildakar. If she can't destroy the approaching army at the city gates, there is nothing to stop it sweeping into the Old World and laying waste to D'Hara itself.