In a different timeline where the Toa are not the guardians of the matoran, but warlords and pirates, Dark Onua is know as the strongest warlord. He and his army have pillaged many villages conquered many foes. His guard wear navy blue skull mask, wielding faint sawblade shields and swords. Dark Onua has heavy amour and a twin bladed axe that strikes fear in his opponents.
Now pictures of Dark Onua
Now the guards are a incredibly simple build, making it easy to build multiple of them: