Ancient robot crated as prototype for Marendar, he is also living weapon but was less powerful then Marendar and had more free will. But in tests he wasn't too good, free will was slowing him down and he was very dangerous, so GB decided to hide him deep in ground and stared works on something better (Marendar), without his own mind, just one order if he will ever awake kill all Toa. But small amount EP get to chamber where Eternal Ultimo was hold and touch him. His body get some changes and become more powerful then he get out from his prison, and his mind was focused on one thing, revenge on GB, and no one can stop him, especially Toa that can't hurt him since he was crated to fight them. That why he likes hunt for them also, and compared to Marendar, he don't kill them right away, but like play with them before it. That my 2 really big MOC in life made month before Golden Mask contest but fits it perfectly. First was in 2009 to a contest too, but I don't have any pics of him. I use HF system because it's parts are stronger somehow. I don't do MOCs from Bio because I'm worry about parts that might broke (especially parts from 2007-2010), for me as a collector of Bionicle it is problem, I have enough broken parts now. I don't know why it is happen, it is bad plastic or construction. I build him also because I'm not fan of HF, and have only few sets that for me was good enough, so I decided to build something from all that sets, also added few Bionicle parts that I had, and here we are. And I must say it wasn't easy thing, because CCBS isn't too good for MOCs like old Bionicle, because it hard to connect parts since there is too much balls connections. Gallery: http://imgur.com/a/5CKvj