Slavery

Slavery is, in the strictest sense of the term, any system in which principles of property laware applied to people, allowing individuals to own, buy and sell other individuals, as a de jure form of property. A slave is unable to withdraw unilaterally from such an arrangement and works without remuneration.

Unlike in the Northern Kingdoms or in the Skellige Islands, slavery is widely practiced in Nilfgaard, where prisoners of wars or criminals, are used not only for manual works, but are even allocated in the army, fighting as a vanguard, before of the "real" army's attack.

Despite that, humans are not the only to use slavery in their sociery, since it's known that even elves, in this case Aen Elle, used the human inhabitants of the land they conquered as their servants. Strangely they only used female slaves, killing all the men.