The Archer Camp is the ranged-troop training building; higher level unlocks higher ranged tiers plus training capacity/speed. Builds Lv1-50, each level requiring the matching Keep level; from Lv26 also Sawmill (and Archer Tower at Lv27/30/32/35, then every level 36-50, plus Barracks at Lv44-49); Lv40 also a Military Academy Ranged Formation research. Ranged tier unlocks: T2@6, T3@9, T4@11, T5@14, T6@16, T7@19, T8@21, T9@23, T10@25, T11@27, T12@30, T13@32, T14@35, T15@40, T16@45, T17@50. Blazon at Lv8. Key milestone: Duty Officer at Lv21 (notably earlier than Barracks Lv25; unlocks with T8; increases Ranged Training Speed and Capacity; ideal John Hawkwood, Sulla, John I of Portugal). Costs mirror the other training buildings (Lv1 1,000/1,000; Lv25 ~11M/14M/15M/14M; Lv50 ~119B/152B/156B/152B). Speed +0% to Lv17, +30% at Lv18 to +610% at Lv50. For a bot: Archer Camp gates ranged tier and ranged training throughput; Lv21 is the priority milestone for the cheaper early duty-officer buff. Ranged (archers) are the standard main-damage layer in the meta.
Original research source: Evony Guide Wiki