Gahlok

"Catching a Gahlok is like trying to hold onto an eel with one wet hand. So think carefully before you interrupt their work."

- Turaga Nokama

Gahlok was a subspecies swarm caste of the Bohrok. They could be described as slippery customers - you would never really know your standing with them. Highly unpredictable, their perplexing methods rapidly changed if discovered. They never reacted the same way twice and never struck the same place twice. Historically, they led the invasion of Onu-Koro, forcing Matoran to evacuate. Nuparu, an inventor, first recognized that the Bohrok were machines during this attack and used a Kranaless Gahlok body to build Boxor machines to save Onu-Koro, and later, much of Mata-Nui.