Armor Break (ability)

"Your pain shall be two-fold" - Auron, Final Fantsy X Armor Break is a recurring skill in the Final Fantasy series, that reduces the target's defense or destroys their armor.

Final Fantasy IX
One of Steiner's Sword Arts, lowers the target's defense.

Final Fantasy X
Found on Auron's area of the Sphere Grid. Attacks as well as nullifying Armoured, meaning that even non-Piercing weapons deal normal damage.

Final Fantasy X-2
Available via the Warrior Dressphere.

Final Fantasy XI
"Armor Break" is a Greataxe weapon skill. Similar effect from the Staff weapon skill "Shell Crusher."

Final Fantasy XII
A Technick by the name of Expose. Also removes buffs.

Final Fantasy Tactics
Used by Knights, breaks a human opponent's armor.