8575 Kohrak-Kal is a BIONICLEset released in January 2003. It contains Kohrak-Kal, who was the Bohrok-Kal of Sonic. Certain versions of the set also included a small CD-ROM with trailers, info, and more. Like the other Bohrok-Kal Kohrak-Kal came with a Krana-Kal.
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?
Kohrak-Kal's sonic powers are so great, even the other Bohrok-Kal must beware of them! Its mastery over sound allows it to create sonic barriers, cause objects to stress and shatter, or even create objects made completely of solid sound! 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.
Kohrak-Kal tends to work alone more than any other Bohrok-Kal. The reason may be that its sonic powers are so great, they are even a threat to its comrades. In fact, the Kohrak-Kal is so awesome that its Krana can afford to ignore danger until the very last moment, then react swiftly and with overpowering effect.
Kohrak-Kal’s tool is a sonic shield. It can change its rate of vibration almost instantly, forming a dense sonic barrier that can repel most forms of attack. It is even more impressive when used in attack mode – bursts of sonic emanations can deafen an opponent or if used at higher intensity can cause almost any target to stress and shatter.
Pushing the lever on its back will cause its head to spring forward.