Kagenui

Kagenui (影縫い Kage Nui) is a recurring weapon in the series, though on one occasion it has been an armor. It is often one of the most powerful short swords in the game, and is oftentimes affiliated with the Holy element as well as the Stop status.

Final Fantasy V
Kagenui is the most powerful dagger in the game, and is only found in the Sealed Temple in the Advance remake. It provides 123 Attack, 126 Accuracy, and +5 Speed, as well as inflicting Stop at random when attacking with it.

Final Fantasy VI
Kagenui, originally translated as Stunner in the SNES and Playstation versions, is a second strongest weapon in the game for Shadow, with Oborozuki being the strongest for him since the Advance remake. It is found in the Cultists' Tower, and provides 202 Attack as well as randomly inflicting Stop when attacking with it.

Final Fantasy XII
Kagenui is a low-ranked ninja sword that requires 40 LP and the Ninja Swords 1 license to wield. It provides 62 Attack, is Dark-elemental, and has a chance to inflict Slow upon hit. It costs 10,000 gil to buy.

Dissidia Final Fantasy
Kagenui is a level 85 parrying armor that provides +1 Attack, +61 Defense, and Bravery Boost on Block +15%.