Manas

Most species of Rahi are not very smart. They use their strenght- not their wits- to battle their opponents. But the most dangerous Rahi, the Manas, are both smart and strong. These gigantic, crab-like creatures are often used as guards,Makuta controlled two Manas, and Karzahni has several Manas in his realm.These Rahi are also attracted to heat. No single Toa could hope to overcome the Manas. The only way the Toa Mata could defeat them was by merging into the Toa Kaita, were the heroes of Mata Nui able to defeat these monsters, which is true as Manas means "monster" in Matoran. No Manas have been seen on the island for over a year. But that doesn't mean they're gone... There could be others hiding deep beneath the surface, just waiting for Makutas call.