Prologue
Since before time there has been a few good spirits. Their numbers are currently unknown, but we do know that they consist of the great Mata Nui.
However, the astrologers and researchers on Mata Nui have discovered long ago (in the times of The Bohrok Saga), that three almost invincible foes exist in the universe. They are known as the Trio of Darkness; Ma-Taru, Makuta, Mata Zuto, and Mata Zuto was the leader.
Two of them went their separate ways to dominate islands of their own. Mata Zuto had is easy. No one was in charge of Zuto-Nui. The villagers were glad to have someone to take directions from. That's what the world needed: direction.
Makuta got his island the hard way. His brother got it first, so he had to fight him. It was so bad, that he needed Mata Zuto to come over from Zuto-Nui and help him.
He never came back.
The Zutorians were wondering and worrying: Where is Mata Zuto? Is he coming back? Is he alright? Is he dead?
These questions were ringing all around Zuto Nui, and in time, the island corrupted. The people turned against each other in frustration. The Protectors, which consisted of Luka-Warrior and Ronkshou-Boxer, came to Mata Nui with Mata Zuto. They never returned either. The Gapuha, giant, humanoid warriors, followed Mata Zuto, and stayed on the island of Mata Nui. They wore cloaks over their heads, so that they were forced to be minions of the dark Mata Zuto.
Then, Lhikan and the Toa Metru came. They revived the people living there, and renamed the abandoned island Metru Nui. It was like old times again, until Makuta came and forced the matoran out of the city.
But this story isn't about Zuto Nui, or Makuta, the Gapuha, nor the Protectors. This epic is about Ma-Taru, the ultimate corruptor of Mata Nui...