Kralhi

The Kralhi are the prototypes of the Vahki law enforcers. They were scorpion-like machines that would absorb energy from law breakers to tire them out. Because of this method, workers became too tired to work from the Krahli's effect, leading them to be replaced by the Vahki and driven out of the city. However, they have all been destroyed in a large battle in the underground river leading to Mata Nui.