Rahi Nui

The Rahi Nui was a mutant Rahi created by the Brotherhood of Makuta, and was given to the Dark Hunters as a gift.

It had the head of a Kane-Ra, the forelegs of a Tarakava, the body and hindlegs of a Muaka, the stinger of a Nui-Jaga, and the wings of a Nui-Rama. It was specifically bred to hunt Toa and feed on their Elemental Energy. When hit by elemental energy, it grew even bigger every time, much like to how a Kraawa reacted to physical blows.

Powers and abillities
It originally had the eight basic Kanoka Disk powers, but lost them after the Toa Metru made it grow so big that its atoms drifted apart (though the creature was able to pull itself back together eventually).