Jem'Hadar

The Jem'Hadar are a genetically engineered species of humanoid Sapients created by the Dominion to serve as infantry and spacecraft crews. They are highly distinguishable by their purplish-blue skin and horned, reptilian countenance. Jem'Hadar are incapable of sexual reproduction and are mass-grown in cloning facilities, where they mature and learn quickly, thus allowing for rapid production. They require no food after maturation (save for White, see below), nor do they require sleep. A Jem'Hadar also have a built in ability to 'shroud' itself, making it invisible. They are very effective soldiers and are normally fanatically loyal to the Founders. However, to ensure loyalty, they have an engineered dependency and addiction to the drug Ketracel-white, which provides all the necessary sustenance required to keep adult Jem'Hadar alive. Without Ketracel-White, a Jem'Hadar goes through withdrawal, which ends in its eventual devolution into insane bloodlust and finally death. This was exploited during the Dominion War by the Alpha Quadrent powers who set about destroying white production facilities.