Xenopsyllian

The Xenopsyllians are a sapient alien race.

Biology
The Xenopsyllians are a viral species, mostly composed of many races that they have infected. Individuality does not exist in the Xenopsyllian: their sole purpose is to spread and multiply. All are controlled by a single queen who is an incredibly powerful psychic being.

History
The Xenopsyllians attacked E.T.H.E.R when Khaal the Executioner was waging a war against the Psycogs and Ethereals for control of the prison ship. They Xenopsyllian Queen was attracted by Khaal charisma and aura, wishing to make him her mate, however instead the vicious human murdered the Queen, taking over her hordes and ship for himself.