Swords Against Wizardry (1968)

Demons and evil gods inhabit the untenable peak of the mountain called Stardock. They guard a magnificent trove of treasure that lies at the heart of the dangerous peak, and the brave warriors known as Fafhrd and The Grey Mouser have decided that they will fight to make the riches their own! As their quest leads them from adventure to adventure, the two heroes find themselves at the threshold of the magical and mysterious kingdom of Quarmall. As they attempt to breach the defenses of ancient and evil sorceries, Fafhrd and the Grey Mouser must learn that where treasure lies, treachery often follows.