Lerahk

Lerahk was a green Son-Of-Makuta Rahkshi, and the Master of Poison. Although not a cunning planner, Lerahk more than made up for what he lacked in intelligence with sheer power. The tip of his staff could poison anything - plants, animals, soil, or any foe he might choose. Unlike Kurahk and Turahk, his power didn't work over a distance - the staff had to be in physical contact with the target.

Lerahk also succeeded in poisoning Tahu during the battle over the mask of light. This filled him with negative emotion and it began to kill him from the inside.