"Minion"

Minion was just another Rahi that the Brotherhood of Makuta experimented on - only the Brotherhood didn't realize that Minion had become intelligent, so Minion was able to overhear and understand several interesting conversations. When the Toa Hagah rebelled against the Brotherhood, Minion slipped away in the confusion and made his way to the Dark Hunters. But he has not spoken since then, and can't or won't give the Brotherhood intellegence that "The Shadowed One" desperately wants. Minion has impenetrable armor and long, sharp claws, and his tracking skills can even detect Brotherhood members on the next continent.