Pathfinder Legends - Rise of the Runelords, 5: Sins of the Saviors (Unabridged)

Description of the book

Ezren, Merisiel, Harsk and Valeros discover that Karzoug, an ancient wizard from the long-dead empire of Thassilon, has returned to life. The secret to defeating him before he can enslave the region lies hidden in a deadly dungeon called Runeforge.