They have been genetically engineered to be resistant to all known toxins, to have an incredibly short maturity time, and to have skills programmed into their DNA.
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The Darhel are implied to be attempting to mold Humans into a race of Mamlukes; recruiting the planet's most skilled warriors to fight the Posleen on Galactic worlds, preserving their bloodlines by moving family members to protected worlds—and permitting the Posleen to conquer Earth, thus leaving Humanity dependent on the Darhel as all other Galactic races.
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In John Ringo's military science fiction series Legacy of the Aldenata, the Aldenata are described disparagingly as "galactic tranzis".