魔人剣 [majin tsurugi] or 'genie blade' in Japanese.
Airborne Brigade

SR+
Type: Katana, Element: -, Growth: ?, Cost: ?
Attack: 6,337 (lv1), ? (lv120), ? (lv150), ? (lv180), ? (lv210), ? (lv240)
Defense: 5,934 (lv1), ? (lv120), ? (lv150), ? (lv180), ? (lv210), ? (lv240)
Obtain: ?
SR
Type: Katana, Element: -, Growth: ?, Cost: ?
Attack: ? (lv1), ? (lv100), ? (lv125), ? (lv150), ? (lv175), ? (lv200)
Defense: ? (lv1), ? (lv100), ? (lv125), ? (lv150), ? (lv175), ? (lv200)
Obtain: ?
Pictlogica

Stats (lv1): STR +33
Stats (lv10): STR +55
Buy: - (sell: ? gil)
Obtain: Valdeaunia Snowfields, initial equipment on Auron
Use: Corruptor
Type: Katana, Rarity: ★★, Element: -
Category: Equipment