The makers of the Avohkii thought the universe needed a back up so they made a copy of it. It was slightly weaker but it was still powerfull. They placed the mask in a village protected by robots. When the robots rebelled, a matoran named Karon used the Avohkii without anyone knowing and defeated the robots. Nobody knew he was Karon so he used this chance to get away from his village. He now wanders the universe, defeating any Makuta or other villians in his way.
His shield. I've been dying to use it for a long time.
Close ups of arm. Most complex that I've made.
As you can see, his torso has 2 Toa Nuva armours on both sides.