This is a description taken from LEGO.com. Do not modify it.
Six reasons to hide!
From the depths of Mata Nui, they came... six elite Bohrok, the Bohrok-Kal, with one mission: to free the Bohrok queens and unleash the swarms again! Only the Toa Nuva stand in their way... but the Bohrok-Kal have stolen the elemental powers of the heroes, leaving them helpless. Will the Toa Nuva's first adventure be their last?
Fast and powerful, Tahnok-Kal is the leader of the Bohrok-Kal squad. Its power shield can hurl lightning bolts or create an awesome force field of electrical energy that no Toa Nuva can overcome! Look for 72 Limited Edition genuine Sterling Silver Krana-Kal and 5,000 Limited Edition silver-colored metal versions in Bohrok-Kal packages. They're randomly packed so you never know where the power of Silver might be found!
This is a description taken from www.BIONICLE.com. Do not modify it.
Tahnok-Kal is fast and powerful, and usually acts as the leader of a Bohrok-Kal squad. Its reflexes are incredibly swift, making it appear short-tempered to those who see it in action. Some have said the Tahnok-Kal is truly as fast as the lightning it controls.
Tahnok-Kal controls the forces of electricity via his power shield. The shield can use energy for defense or fire lightning bolts at an opponent.
Pushing the lever on its back will cause its head to spring forward.