Today I present two of my older Bionicle MOCs, both non-canon Rahkshi. The first is the Great Rahkshi Kluurakh. Kluurakh was formed from the exceedingly rare act of fusing a live Stage 7 kraata of Confusion into a Stage 7 armor. The unexpected result was a creature of extraordinary size, strength, and, to Terridax's dismay, intelligence. Kluurakh's will was strong enough that he was able to escape the Makuta's mental control, even in close proximity, and live as a free being. Not much is known of his life, though it is believed that he lives in deep caverns beneath Metru Nui to this day.
Here's a size comparison with the normal type:
Next up is Tierakh, pronounced "tee-eh-rock." Tierakh was raised & trained to be a personal bodyguard of Teridax. His most exceptional feature is his Shadow Shield, an intangible device powered by pure elemental shadow energy. It appears as a very small, shadowy field, but when an attack is inbound, whether physical or energy-based, the shadow force extends forth and concentrates ahead of where the attack is aimed, absorbing it and rendering it ineffective.
It is believed that Makuta Teridax absorbed the life force of Tierakh to supplement his own power in advance of usurping control of the body of Mata Nui.