Just re-posting the features for slavery from the public development thread so that it is easier for us to find(with a couple minor changes): Slavery: To enable all slavery features, you need to be using the Slavery civic. If you stop using the Slavery civic all slavery features are disabled. If you stop using the Slavery civic, all slavery promotions are removed, and all slavery pens are destroyed. A unit built in a city with a slave pen gains the slaver promotion (I will call this a slaver unit). A unit victorious in battle has a chance to enslave the defeated unit. If a worker or settler is captured with a slaver unit, it automatically becomes a slave. A slaver unit can attempt to capture slaves from an enemy city. If a slave is captured from the enemy city, its population is reduced by 1. A city with a population of 1 can not be targetted for slave capture. If a slaver unit razes a city, there is a chance of creating 1 slave for each population size of the city. This random chance is attempted for each individual slave. A slave unit can be used as a worker unit, but will work slower than a normal worker. For each slave unit in a city with a slave pen, production is increased by 1 for that city. A slave unit in a city with a slave pen and either a Temple of Gruumsh, Nerullic Temple, Dark Seldarine Temple, or Hextorian Temple can be sacrificed for a culture boost. If slaves are in a city with a slave pen, there is a chance for a slave revolt. The percentage chance depends on how many slaves are in the city. A slave unit in a city with a slave pen can be sacrificed for a production boost. If a slave unit is sacrificed, the chance for a slave revolt increases. This increased chance decays over time.