| Somebody Isn't Doing Their Job
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A troller's mouth was said to be large enough to swallow an entire block of a Metru. They were one of the most dangerous Rahi in Po-Metru. One was encountered by Toa Metru Onewa, Nuju, Whenua and Turaga Lhikan when they broke out of their cell inside the Dark Hunter Prison in BIONICLE Adventures 4: Legends of Metru Nui. (However, in BIONICLE 2: Legends of Metru Nui, the Troller did not appear.) Onewa then used his Kanohi Komau to control the Rahi's mind and have it take them safely through the Metru inside of its mouth.