The Castle Triskelion Mega-Dungeon: Outer Ward Lower Level

From the Introduction:

The Lower Level of the Outer Ward is occupied by several undead monsters. Its original purpose was to house the stable hands and the smith who took care of the horses in the stable, an outer building which has since been destroyed. In most areas, the floor is ten feet below the ground level and the ceiling height is very cramped for the castle at eight feet. The place is cold and drafty. Most rooms have indentations for torches. Note that Rooms 14 and 15 are not connected to the rest of the level, and are somewhat deeper than the rest of the level.

This level directly connects to the Ground Level of the Outer Ward and to Level 1 of the Upper Dungeons.