What is the best chest to buy to get bonuses from the Item Archives?
Answer: Alpha Chest is the best to maximize your Item Archive bonuses. It gives you a total of 29 Attack, 6 more Attack if you have 5 Cronus the World Hydra, and gives you part of 2 other Sets.
Crom: 3 Attack and is part of Ravager Set 1 (6 Attack)
Orc King: 8 Attack
Mephistophles: 9 Attack
Orc King, Mephistopheles, and 5 Cronus the World Hydras (Alchemy) make up Adversary Set 1 (6 Attack)
Sylvana: 9 Attack and is part of the Relic Set 2 (4 Attack)