Morbuzahk

The Morbuzakh is a plant-like creature that was created by Makuta to drive the Matoran into the center of Metru Nui where he would enslave them. The Morbuzahk's King Root originated in Ta-Metru, the Great Furnace to be exact. It slowly spread across the city.

The Morbuzakh was killed when the Toa Metru used the great kanoka disks against it.

Behind the Sets
The Morbuzahk's prototype was the Karzahni, a sentient creature. This fact caused it to rebel against Makuta Teridax, causing the necessity of a less intelligent creature.

Appearances

 * BIONICLE Adventures 1: Mystery of Metru Nui
 * BIONICLE Adventures 2: Trial by Fire
 * BIONICLE Adventures 10: Time Trap(in Makuta's illusion)

The movie
For unknown reasons, the Morbuzakh was not included in the second bionicle movie, which resulted in a large loss of plot in the aforementioned movie.