Military books Lv1/2/3/4: March Size 3/6/9/12%; March Speed 10/15/20/25%; Renascence 15/25/50/75%; troop Speed (per type) 5/10/15/20%; every troop-type Attack, Defence, HP 10/15/20/25%; Ranged Range +25/50/75/100 (flat); Siege Range +50/100/150/200 (flat). Development books: Gatherer (per resource) 15/25/35/45%; Troop Load (per type) 15/25/35/45%; Luck (double drop) 5/10/15/18%; Monster's Respect (EXP) 10/15/20/25%; Monster March Speed 15/25/35/45%; Against-Monster Atk/Def/HP (per type) 15/25/35/45%. Subordinate-City books: Rebirth 1/2/3/5%; Construction 15/25/35/45%; Gold Production 15/25/35/45%; Training Capacity 15/25/35/45%; Training Speed 10/15/20/25%. Debuff books (enemy type Atk/Def/HP): -2/-5/-9/-15%. Duty-officer books add small in-rally / defending-troop buffs (e.g. Forge Officer In-Rally Ground 2/4/10/20%). Key takeaways: Lv4 is worth ~2.5x Lv1; Luck maxes at 18%; troop-type combat books cap 25% at Lv4.
Original research source: Evony Guide Wiki
