Bohrok Pahrak
The Bohrok are driven by one purpose, to cleanse Mata Nui, restoring it to its former state as a completely barren wasteland. The Bohrok are controlled by the Krana, an intelligent organism, which they cannot function without.
The Pahrak are the most unrelenting of the Bohrok, never giving up until their destructive work is done. Their shields have the power to set off earthquakes, and they can move massive boulders with their bare hands. No matter what the obstacle, Pahrak can reduce it to rubble! But if you remove their krana, the Pahrak can be tamed!
After the defeat and imprisonment of the Bahrag, the Bohrok had their krana removed and were reprogrammed by the Matoran, to aid in rebuilding the Matoran villages.