Mutsunokami

Mutsonokami is a recurring weapon in the series. It is often the most powerful Katana in each of the games it appears in, though it didn't start appearing until the Advance remakes of the earlier games.

Final Fantasy IV
Mutsonokami is the strongest katana in the game, only appearing in the Advance remake, and can only be used by Edge. It has an attack of 100, accuracy of 45, and grants +10 Strength and Speed. It is found at the Lunar Ruins.

Final Fantasy V
Mutsunokami is the strongest katana in the Advance remake, and is found in the Shadowed Gate section of Lethe Court. It has an attack power of 139, and can only be used by Freelancers, Samurais, and Gladiators.

Final Fantasy VI
Originally translated as Sky Render, Mutsonokami is the 2nd strongest katana in the game, used only by Cyan. It can be won from Fiend or by betting the Aura Lance in the Colosseum. It has an attack power of 215 and increases Evade by 20%.