User blog comment:Chicken Bond/BIONICLE's Return?/@comment-25133993-20140706072101/@comment-24847792-20140708023411

FYI Karov, Marendar is a robot created by the Great Beings to kill the inhabitants of the Matoran Universe (specifically, Toa, I believe) should they ever go rogue on Spherus Magna. In one of the unfinished story serials, it is known to have escaped onto the newly-reformed planet, where it would hypothetically start killing Toa, but we never see anything else, since the story is just that - unfinished.