From the introduction: Disaster Within is an AD&D adventure intended for six to eight dwarven player characters of levels 6-9 (about 55-60 total levels). The party should include at least one cleric, a few strong fighter types and be of neutral or good alignment. The party should be one that works well together. The entire adventure is set in a vast northern mountain range, home to a remote kingdom of dwarves; known as the "Halls of Thorlin".