The Rahkshi BIONICLE are suits of armour controlled by slug-like creatures called Kraata and are often called the sons of Makuta. This happens when Rahkshi a is exposed to a substance called energized protodermis, it dies and mutates into inanimate Rahkshi armour. When Rahkshi have no mission from a Makuta to fulfill they become violent and dangerous beasts. However, with guidance from Makuta they have power enough to overtake even the powerful Toa Nuva.
The BIONICLE theme is series of sets based on modified TECHNIC pieces and ball-and-socket joints to create larger figures. Bionicles coincided with a series of comic books and graphic novels released during the set's run from 2001 to 2016. The theme was introduced in 2001 and originally discontinued in 2010, being succeeded by Hero Factory but additional sets were also released up until 2016 after it's break in 2010 to 2014. BIONICLE sets were tied together by an elaborate original storyline within the comic books and other multimedia that centered around bio-mechanical characters which are generally large, powerful beings that usually serve for good. The name BIONICLE is short for BIOlogical ChroNICLE.