Protocairn

The Protocairns are surely one of the most bizarre creatures ever seen on Metru Nui, perhaps only their rumored origin is stranger than their behavior. According to legend, the Protocairns were once a small group of villagers from another land who willingly exposed themselves to Energized Protodermis. They were transformed into monstrous, amphibious beasts. Every hundred years or so since then, Protocairns appear on the shore of various islands and wreak enormous destruction, actually disintegrating large portions of the coastline. After a short time of this, the Protocairns die and their bodies fuse together, forming new land in place of the old they destroyed. The spit of land the Great Temple is built on was formed after Protocairns destroyed the original. While they live, they are extremely difficult to stop, although Vahki squads have had success driving them away over the past few centuries.