IX Shift Break is an ability used by Zidane when he enters Trance and has the ability Soul Blade, either mastered or available at the time he is in Trance. Shift Break inflicts non-elemental physical damage to all enemies at 200% of a regular physical attack by Zidane, and costs 16 MP to use.
Dissidia Shift Break is a HP Attack for Zidane, initially learned at the start of the game. It requires 40 CP to equip (20 when mastered) and 180 AP to master. It can only be used while in the air, is magic-based, has mid ranged priority, is unblockable, and has the Absorb effect on it.
Dissidia012 Shift Break returns as a HP Attack initially learned by Zidane, and functions the same as in the previous game. It now requires 130 AP to master and 30 CP to equip (15 when mastered).