Karzahni

Karzahni and his brother Artakha were two of the first creations of the Great Beings, and each was given a domain to rule over. Originally, Matoran were sent to Karzahni in order to be repaired - but Karzahni never really did a good job. He tried to make up for it by supplying the Matoran with weapons to defend themselves, but eventually Matoran stopped being sent to him. Some of the Matoran that Karzahni had "repaired" were sent to the area which eventually became the island of Voya Nui. Over time, his and Artakha's realms passed into legend, with the myths saying that bad or lazy Matoran were sent to him not for repair, but for punishment.

Karzahni has an ancient appearance, with ebon- and gold-colored bladed armor and a mask that is seemingly made of three or four older masks patched together. He speaks in whispers and has deep hollow black eyes. He carries a burning chain and his gauntlets crackle with energy. His Kanohi Mask can make himself and others experience alternate or possible futures, usually bad ones (for instance, Jaller saw the devastation which would have come to pass if Takua had never become Toa Takanuva). When Matoran enter his domain, he has them abandon their old masks as a way of making them abandon their old identities, and he uses his alternate-future power to make them lose hope, making them little more than zombies.

Until recently, he did not even know of the Makuta or Mata Nui. At first, he didn't believe the tales, but then through his own mask power he saw that the universe would cease to be if Mata Nui died. Now that he knows what exists outside his kingdom, he aims to take control before Mata Nui wakes up - and it seems that Makuta will become one of his first targets.