Seirez

Seirez was the "brother" of the Demitoa Exerius, and he once had the desire of stealing his brother's technology. Along with Exerius, he owns a hardsuit, which he had created after he stole the blueprints from him. He is hard to comprehend, whether he is good or bad is a ponderous question.

History
After Exerius created his original hardsuit, Makuta Zerax had attacked him with the Spear of Fusion. This split Exerius into two, creating Seirez. Zerax wiped their memories and convinced them that they were brothers. For years they were rivals, and Seirez was often seen trying to steal Exerius' technology. After he succeeded in stealing the power armor's blueprints, he managed to create a powerful hardsuit of his own. Since the Minifigures had invaded the Bionicle universe and they were weak, he changed and sided with the Nuvai Alliance. Although, it is not known whether he has completely sided with them, for sometimes he acts suspiciously. Seirez assisted the Elite Hero Zaephre, his brother Exerius, and the whole of Hero Factory to defend from the minifigure invasion. However, he perished while setting his hardsuit to self-destruct, which helped diminish the minifigure's forces.

Other Information
There was a time when Seirez and Exerius were fused to eachother once again, but since they had been apart so long it was very difficult for them to stay as one.