Pool of Entropy

Pool of Entropy is a pool of Energized Antidermis, which was the reason that Makuta were recreated after Teridax died.

Creation
The pool is an old place created by the great beings, over 100,000 years ago, when they first designed the Matoran. They created it to spread a little evil around the world, such as creating the night, shadows, etc. But after sometime, the pool created evil on its own, which was the sign that it had a mind of its own. They put it into a eternal sleep, never to be woke up again, unless by a Great Being. For some reasons, the great beings all forgot about this pool, except one, named Aserix. The pool was left like that for 100,000 years.

Rise of the Shadows
The pool was woke up by Aserix, the great being. As the pool was not completely pure (had some Protodermis in it), it had the power to teleport, which it used to teleport itself to the secret room under the Shrine of Mata Nui, to spread evil all over the Sphera Nui. It was prevented then by Ignika, the mask of life,