ミスリルハンマー [mythril hammer] in Japanese.
Final Fantasy I
Stats: ATK +12, ACC +5
Equip: ?
Obtain: ?
Description: A hammer wrought from mythril
Final Fantasy IV
Stats: ATK 65, ACC 90, STA +3
Equip: Cid
Buy: 8,000 gil (sell: 4,000 gil)
Shop: Mythril
Drop: Armadillo, Fell Turtle, Ironback, Magma Tortoise
Treasure: Tower of Zot B5
Other: 1.5x damage to machines and ghosts
Final Fantasy V
Stats: ATK +25
Equip: Berserker
Buy: 1,050 gil (sell: 525 gil)
Shop: Karnak
Crystal Chronicles
Strength: 30
Equip: Yuke
Buy: Master's Weapon -scroll, Alloy, Mythril, 700 gil
Other: Focus attack Shock Bomb
Record Keeper

Mythril Hammer (IV)
Stats: ATK +12, ACC 86 (lv1), ? (lv5), ? (lv10), ATK +36, ACC 86 (lv15)
Max Level: 5 (initial), 10 (first evolve), 15 (second evolve)
Type: Hammer, Rarity: ★★
Category: Equipment