Lists which equipment-crafting materials come from each chest/bag. The 12 material types: Purple Crystal, Blue Stone, Red Agate, Silver Pearl, Meteorolite, Iron, Bronze, Wood, Animal Bone, Leather, Feather, Dragon Scale. Multi-item chests (give one or two): Small Material Chest = Lv1-2 of all 12; Intermediate = Lv2-3; Large = Lv3-4. Single-item colored chests: White = Lv1 (all 12); Green = Lv2; Blue = Lv3; Purple = Lv4. Material Bag (Silk Road) = one Lv5 item of any type. Persia King's Treasure = one Lv5 of Wood/Animal Bone/Leather/Feather/Dragon Scale (organic materials). Pharaoh's Treasure = one Lv5 of Meteorolite/Iron/Bronze/Dragon Scale (metal materials). All contents random within the pool. For efficient farming the page recommends hunting many bosses, especially Vikings. For a bot, materials feed the Forge/Wonder for equipment; farm them via boss/Viking hunts and Research Factory production (Lv3-5 by factory level).
Original research source: Evony Guide Wiki