The phrase "human slaves" refers to people who are forced to work for someone else, without their consent, and often under harsh conditions, with no freedom or rights of their own. Full definition
Shadow of Mordor can offer nothing better than that: the plot is average, and side missions range from the severely limiting «kill x orcs in this specific way» to the unreasonably tedious «free these identical human slaves (again)». (impulsegamer.com)
Of course, one might take exception to a game that includes the ability to own and command human slaves, and they might also be taken aback by the game's explicit (optional) nudity and ability to design a player character with outsized, physics - based genitals. (darkstation.com)
Though initially disturbed by the unpredictability of the tournaments, the alien Empire soon realized the benefits of providing human slaves with an outlet for their more carnal tendencies and desires. (old-games.com)