Rahi Nui

The Rahi Nui is a mutant Rahi created by the Brotherhood of Makuta, and is know currently owned by the Dark Hunters.

It has 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 grows even bigger every time, much like to how a Kraawa reacts to physical blows.

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). It was more recently defeated again when it got its horns stuck in a wall while fighting the Toa Nuva.