Each caste is divided into several tiers. The bottom of the ladder consists of Minions, whose purpose is to conduct day-to-day tasks of the caste, and Security, who are charged with keeping everyone else safe. Above them are specialists of various kinds: Pilots, Engineers, Medics etc. who can be exchanged for a better ransom or interrogated for any secrets they may hold - such secrets will prove crucial to our advancement. Their superiors are the middle-level leaders: the Reps, the Espers and the Reverends, but interrogating these beasts will be useless without sufficient preparation. On the very top of the hierarchy are VIPs; the richest and the most powerful.