Krana Bo-Kal were one of the eight types of Krana-Kal. They granted their Bohrok-Kal with the power of X-ray vision. A Bohrok-Kal with this creature could see in the dark and through most substances. Only the walls of caves and tunnels beneath Mata Nui were impervious to this power.[1, 2] Their power was X-Ray Vision.
The Bo-Kal was able to see in the dark and to see through most substances. The floors and walls of the Mata Nui underground blocked this X-ray vision.