Abyss

The Abyss was a maze of tunnels and caverns inside the wreckage of the Mata Nui Robot. It served as the lair of the Demons in the Seeds of Madness Alternate Universe.

Creation
The Abyss was created during the events of The Fall. When the Mata Nui Robot collapsed into Aqua Magna's surface, the Robot's interior became mangled and partially flooded. In these depths, Nocturnus and the remnants of the Blackfire Knights gathered their strength and built citadels and mines in their new home, which they named the Abyss.

The First Abyssal Invasion
During the First Abyssal Invasion, most of the Demonic inhabitants of the Abyss emptied onto the surface, in an attempt to conquer the