A troller was a massive, horned, wormlike beast. It was one of the most feared creatures in Po-Metru. It lived far beneath the sands, emerging only now and then to feed. No Po-Matoran had ever stayed in the vicinity of a troller long enough to find out just what it ate. Its gaping mouth was large enough to swallow an entire block in a metru. When one was disturbed by the Toa Metru, it emerged from the sands with a monstrous groan. It had hot, fetid breath.