The Lost

From Introduction:

This module is designed for 4-5 characters of the 1st level of experience. Although this adventure is set in the world of Citadel , it is loosely written, and can be easily modified to fit into a number of other campaign worlds as well. The story takes place amidst the gloom of a fetid swamp, deep in the Hurad Wilderness, where a temple of Keltahs (god of the sun and strength) lies forgotten and undisturbed, hiding a hideous and terrible secret. Classes such as the Ranger and the Druid will have their chance to shine in the wilderness of the swamp, while other classes, such as the Fighter and the Cleric will prove their valor in the depths of the ruined temple.