Rush Assault is a Limit Break-esque ability for Zack, obtained at the start of the game. It is used when Angeal Hewley's portrait lines up in the reel during modulating phase.
Rush Assault deals non-elemental physical damage while ignoring the target's Vitality, with the final hit inflicting Stun, and also may grant Endure to Zack. The attack hits up to three times with different attack power, and each hit will hit a random enemy. The power of the first hit is 7 at level 1, and increases by 1 per level up to 11, while the second hit has a power of 12 at level 1, 18 at level 2, 20 at level 3, 24 at level 4, and finally 32 at level 5. Level 5 increases the Emotion Gauge by 1 level.
Rush Assault is Zack's Second ability which is unlocked at crystal level 20.
Rush Assault is a 8 hit Brv+HP attack that deals more damage if Zack is targeted by the enemy he is attacking.
Rush Assault can be upgraded by equipping Zack with his Buster Sword V.Z weapon or by equipping the SOLDIER Martial Arts passive skill. This makes Rush Assault do more Brv damage and also gives Zack HP regen for 5 turns after using the ability.
Rush Assault is upgraded again when Zack is upgraded to crystal level 60 and equipping the Rush Assault Extension Passive skill. This turns the ability into a 3 hit Brv+HP attack followed by a 2 hit Brv+HP attack and then a 3 Hit Brv+HP attack. it also gives Zack Brv based off of 10% of the HP damage done by the ability. It also turns Zack's HP attack into HP attack+