Kralhi

Kralhi were a prototype Vahki built by Nuparu. He presented the model to Turaga Dume, who found it powerful but insufficent, as the stinger the Vahki used as a weapon enclosed Matoran in a bubble and drained all their energy, leaving them far too weak to work for weeks. But due to production costs they remained in service for a few weeks until Nuparu built less damaging Vahki. But the Kralhi refused to be shut off, and escaped to the lower sections of the Archives.

Behind the Sets
A Kralhi can be made by combining the parts from the Onewa, Vakama, and Matau Toa Metru sets.