The Council of State grants new buffs by appointing generals to positions; higher level unlocks more positions. Buildable at Keep 1 but requires the Pasture and Victory Column raised first (rows gated by Pasture 27-35 and Victory Column 1-10). Menus (Senate, Soul Binding) available from start; Soul Binding links two generals to inherit specialty/general level. Each level adds to total Generals Capacity. Position-unlock milestones: Lv1 Governor>Ground; Lv4 Governor>Mounted; Lv7 Governor>Ranged; Lv10 Governor>Siege; Lv13 Commander>Ground ... Lv30 Marshal>Siege. Six Military Titles x four troop-type positions = 24 positions; Senator-tier positions unlock via Server War/Gaugamela/Constantinople achievements at Council Lv8. Buffs come from three levers: promoting Military Title grade, leveling a Position (Merit Jade + Glory Golden Twig), and appointing star-6+ generals. Appointment needs a star-5+ general (golden historic only -- purple cannot be appointed); appointed generals are locked from all other uses. For a buff-automation bot this is a major PvP combat-buff source gated behind Pasture/Victory Column progression, low priority for pure economy.
Original research source: Evony Guide Wiki