Akriin is a Vo-Toa mercenary, and perpetrator of the Monorail Bombing . He is a mercenary, currently in custody of the Ta-Koro guard.
Akriin has very little for back-story, other than being an ordinary mercenary.
He uses a unique sword with two blades pointing sideways from the handle, so that he can stab with a punching motion.
He wears the Kanohi Sahnok, the mask of accuracy.
Akriin gained widespread infamy when he took a contract from a so far unknown Onu-Matoran. This contract involved setting explosives beneath the Ta-Koro monorail system and set them off. He then went to Ko-Koro to escape from the Guard, but was tracked down by four Toa from Ta-Koro. He then surrendered non-violently, and followed the four back into Ta-Koro.