Drukhari

The Drukhari are mainly pirates and slavers who prey on targets across the galaxy to feed their unholy appetites for other sentient beings' souls. 

The Dark Eldar are the living embodiments of all that is wanton and cruel in the Aeldari character. Highly intelligent and devious to the point of obsession, they revel in the physical and emotional pain of others, for feeding upon the psychic residue of suffering is the only way they can stave off the slow consumption by the Chaos God Slaanesh of their own souls.