Legend of the Bohrok

It is said the Bohrok sleep an eternal sleep, waiting to hatch.
Once awakened, the swarms are unstoppable.  They are a force so powerful, they
can reduce mountains to rubble and turn life-giving rivers dry as the desert
sands. The Bohrok swarm won't stop - not until all that is known of Mata Nui
is gone.

Their strength goes beyond their powerful exterior; it is hard to see and well
protected. It is the Krana, the creature within. But Krana are also their
greatest weakness for even the mightiest Bohrok can be humbled, if parted
from their Krana.