"Poison"

History
The majority of Poison's species were wiped out by Matoran and he gowned to hate them over the years.

When the Dark Hunters first encountered him, Poison was found attacking a Matoran settlement and was fought off by the local Toa. It was only later when the Hunters brought Poison to their base where they discovered that he had not been using his venom. Nidhiki then taught him how to use his powers and discovered that Poison does not have any weaknesses other than his own venom. After Teridax's death he immigrated to the newly formed Spherus Magna.

Abilities and Traits
As his name suggests, he had a storage of paralysing venom which was fatal if a victim was not treated within half an hour. Apart from his venom, Poison also had a tail that delivered a powerful stun.

Trivia

 * Poison was created by Issac Evavold.