"Night's Dark Terror" is a wilderness scenario in which the player characters travel by river and over mountains, from the Grand Duchy of Karameikos to the chaotic lands. The characters encounter a town under siege by goblins, a ruined city, and a lost valley. The module teaches the Dungeon Master (DM) how to handle wilderness conditions, and includes new rules for weather. The module also includes statistics for eleven new monsters, and comes with a battle map and counters for use in staging a battle in one of the towns.