Makuta Zeth had been a loyal servent to Makuta for many years, but was banished when he fell for a trap the Toa had set. Ever since then he has been trying to take down the Toa, this has been made hard by the fact that Makuta has taken away his mask power.
Ever since he was mutated, this Matoran has been trying to seek his revenge on the Matoran who fear him and attack him. His desire is to live with them and rule them. He has poison breath and can duplicate.
Bionicle come to the rescue once again. Cassius has been spending time on the lego network. He calls it Lego facebook. He has been posting pictures of his Lego creations and writing descriptions of them. He tells me what he wants to write and I write it out for him. He then copies it out on paper or types it – so he has been getting some writing practice I was so worried about!