My dad has actually found the Dark Hunter essay!
“ This Dark Hunter will hunt anything when ordered to by the Mysterious Shadowed One. The Toa Hordika haven’t seen him yet because lately he has been hunting for Keetongu. Now his new assignment is to hunt down and destroy the Toa Hordika. This Dark Hunter is a lot taller than Nidhiki and Krekka, but there is a reason for that…. After each hunt, he will search the victim’s remains for anything worth taking. He will then, add those components to his body. Despite his appearance, he is not only very strong, but he is also very smart. Not only can he speak Matoran, but also by hunting Rahi and Rahaga, he can speak to Rahi. He doesn’t stalk his prey, but as soon as he sees it, he lets out a blood-curdling scream, and goes on a rampage.
This Dark Hunter has a radar/tracer atop his head. It cannot trace one that is sleeping, and it’s hard to trace one with armor, but it can be done. His glider wings run on concentrated Protodermis that works as fuel. It runs out after about two hundred miles. The spikes on his feet and thighs are used to climb ledges incase he can’t fly up there. All of the tubes along his back are strength-amplifying Protodermis tubes. They make him twice as strong. It only lasts ten minutes. He wields Metru-Nui’s largest sword dubbed “The Punisher”. He bares the Kanoka Disk of Slicing. It’s said to slice through anything. He has the Rhotuka Spinner of Venom, said to poison anyone with incurable venom in seconds! He also has a fiery breath. His large fangs have small compartments of venom much like the kind that the Visorak use.”
Also, I wonder how blood-curdling works in a world full of robots 
EDITED FOR DOUBLE POST - Spiderus Prime