Used book – The Belgariad, Book Three: Magician's Gambit, David Eddings

Then the sun sank into the banks of clouds, along the jagged horizon, and bathed the sinister fortress in an unhealthy glow. It was as if the walls were bleeding, as if all the blood spilled on Torak's altars since the beginning of time had suddenly splattered the city of fear. All the oceans in the world would not have been enough to wash it away. A cry of agony filled the air. Garion, terrified, looked up. "It is the season of the Wound," said Belgarath. "The season when the Orb burned Torak. The opportune moment for human sacrifices." The Orb... The Orb was there, in the thief's hands. Garion looked at his companions. They had to recover the stone where life pulsed. The fate of the Western Kingdoms depended on it. But tomorrow morning, would they see the sun rise?