Troller

Trollers were huge, horned, worm-like beasts that lived beneath the Po-Metru sands. Its mouth was large enough to swallow an entire block of a Metru. They were one of the most dangerous Rahi in Po-Metru. Toa Metru Onewa, Nuju, Whenua and Turaga Lhikan encountered one in when they broke out of thier cell in BIONICLE Adventures 4: Legends of Metru Nui. However, in the movie, the Troller did not appear.