The Nightmare Chamber, also known as the Nightmare Zone or Zone of Nightmares, was a section of the 777-step staircase that led to the Chamber of Life. In it, the greatest fears of those passing through could come to life.
The Zone of Nightmares was a cavern found along the staircase leading to the Chamber of Life. Anyone entering it would see their worst fear brought to life.
Had two groups with different fears, such as the Piraka and the Toa Inika, entered the Nightmare Chamber at the same time, each group would face a different opponent.