To save the kingdom from destruction, they must challenge a god.
Lewis's D&D 3.5 campaign set in the Principality of Corwyn in the mythical world of the North Kingdom. Evil yuan-ti conspire to destroy a kingdom using dark rituals and the bones of a long-dead king. To win the day, heroes must storm the yuan-ti fortress and wrest the bones from the cultists' clutches before they complete their rituals and unleash a far greater menace upon the world.