Editing Eyes of the Emperor (section)

==The three castes of the Legion==
[[File:Eyesoftheemperor.jpg|200px|thumb|A warrior of the ''Satria'', wearing the Legion's black battle robe.  This garment signified the hatred the Eyes felt towards the enemies of mankind and their willingness to slay those who endangered humanity.]]

Under the leadership of the Ten, the Eyes developed a strict caste system.  The gene-seed a new recruit determined their rank and role in the Legion.  Gene-seed harvested from the smaller Progenoid Gland in a marine's neck would bind its recipient to the same caste as the donor.  However, the Legion's medicae carefully inspected the gene-seed of a fallen Brother to determine whether the warrior's life had purified or debased the material and destined his successor for another caste.

The '''Satria''', the lowest caste, were the ordinary warriors of the Legion.  They had three orders.  The lowest and most numerous were equipped as ordinary marines, filling out the Tactical and Support Squads.  The middle order went into battle using the stealth equipment of Reconnaissance squads.  Heavy Support roles were reserved for the most highly-regarded of the three Satria orders.

The '''Wesias''', the middle caste, were the most technically able part of the Legion.  Their most prevalent duty was the supervision and maintenance of the Eyes' many servitors.  As with the Satria, they formed three orders.  The lowest formed close-combat squads for the defence of the Legion's warships and fortifications, although their skills would sometimes be used in an offensive role.  The middle order operated the Legion's many sophisticated vehicles and bikes.  The most honoured of the Wesias aspired to win their gene-seed a place among the ''Acharya'' caste.  These warriors formed the Nineteenth's Terminator Brotherhood.  Cutting across the evaluation of the Council of Ten was the judgement of the Mechanicum.  All of the Wesias had the right to petition the techpriests for training, and TechMarines could be found in all three of the caste's orders.  Although the influence of the Forge Worlds made the Wesias less reverent of the Acharya's gene-seed, Master Forge was able to command the caste's loyalty thanks to his contributions to the Quest for Knowledge.

At the peak of the Eyes of the Emperor were the '''Acharya''', the direct gene-descendants of the Council of Ten.  Some were indoctrinated as Apothecaries or Librarians but the majority were warriors, entrusted with all of the Legion's leadership positions.  They styled themselves as "mere teachers", the elder brothers of the other castes who were responsible only for guiding other Marines into deeper understandings of the Imperial Truth.  But their grip on the Legion was absolute, especially as the Primarch Shakya Vardhana showed no inclination to challenge them.