The Essens, should they find any would-be rescuers, would try to bribe them with self-made Tehk'la blades or electromesh armor, because they believed that every sentient would be motivated by material goods instead of abstract morals.
Phylus Mon surgically inserted an explosive near the heart of each of his slaves. The explosive would be activated in the case of Phylus Mon's death, but it could also be deactivated with the impact of an ion weapon. All the slaves in Phylus Mon's zoo were also regularly battered.