Bladeblitz

Bladeblitz, also known as Slash-All , Wide Slash , Omni, Debug Attack or Blade Blitz, is a recurring ability in the Final Fantasy series. It typically allows the user to attack all enemies simultaneously, though the damage is much weaker than if the user were to attack a single enemy.

Final Fantasy IV: The After Years
Omni, a dummied out command enables a character to perform a physical attack with his/her equip weapon which strikes all enemies on the screen with a normal attack per turn. It is also far more superior to the Kick command.

Final Fantasy V
Bladeblitz is the last ability learned from the Gladiator class, exclusive to the Advance and iOS remakes, and requires 450 ABP to master. It allows the user to attack all enemies physically, with the damage done being 75% of a normal attack. The ability completely ignores a weapon's special function if it were to cast a spell or has a unique ability, and will not work with weapons that casts spells such as harps and the Wonder Wand.

Final Fantasy VII
Slash-All is the initial ability of the Slash-All materia, which can be found in the Ancient Forest. Unlike a normal physical attack, Slash-All can hit targets in the Back Row for full damage without requiring a Long Range weapon, and all status inflictions done by the attack is considered No Split, even though the damage itself is split between enemies.

Final Fantasy X
Though not directly named, in the data files, or when using the "control enemies" option, either through the Debug Menu or the cheat device code, Braska's Final Aeon's sword swipe is called "Blade Blitz". Blade Blitz swipes at all party members at once and inflicts a mild delay effect; it is possible for it to miss.

Final Fantasy: The 4 Heroes of Light
Bladeblitz is the second ability learned by the Hero first gained by upgrading said crown. When used, it hits all enemies for the same amount of damage that would be inflicted by a normal attack, and has a chance of missing.

Bravely Default
Crescent Moon is an ability used by Valkyries. It is initially available and costs 1 BP to use. It unleashes a physical attack on all enemies, dealing the same damage as a conventional attack.

Final Fantasy Dimensions
Wide Slash is the level 17 ability of the Paladin class, requiring 440 AP to learn. At the cost of 35 MP, the user will physically attack all enemies.

Debug Attack is a dummied out battle command that allows the user to executes a physical attack against all enemies on the screen.

Etymology
It has also been known as "Omni".