Ithkul

The Ithkul are one of the playable races in Master of Orion 3. They are a "harvester" species, created by the Antarans as a biological weapon against all other races.

Description
The Harvester Project was the result of the Antarans’ quest for a biological agent that would infect most life forms and either kill them outright or render them mentally docile and obedient. It was a major endeavor, with dozens of research labs working on various facets of the project. And, in the end, the Antarans succeeded in breeding a parasite that did exactly what they wanted it to do. Now that parasite has been unleashed, and the Orion Sector races are right to be afraid of a species dedicated to wiping them out to the last.