Flurry

Flurry, previously known as "Slash Combo", is a Special Attack in Kingdom Hearts Unchained χ / Union χ.

HD Zack

Flurry (連続斬, Renzokuzan^?, lit. "Continuous Cut")
Rarity	Description	Damage							Target	Gauges	SAB
Rarity	Description	○○○○○	●○○○○	●●○○○	●●●○○	●●●●○	●●●●●	Max SAB	Target	Gauges	SAB
6★	Deals 13 hits. 1 turn: ↑ Upright STR by 1, S-STR by 4, ↓ targets' Upright DEF by 1, DEF by 1. Inflicts more damage the higher the slot number.	x2.60 - 3.82	x2.70 - 3.92	x2.80 - 4.02	x2.90 - 4.12	x3.00 - 4.22	x3.10 - 4.32	x9.30 - 12.96	All	4	7
7★	Deals 13 hits. 1 turn: ↑ U-STR & S-STR by 4, ↓ targets' U-DEF & DEF by 1. Inflicts more damage the bigger the slot number.						x8.26 - 9.48	x24.78 - 28.44	All	4	7

Origin

Chain Slash is a signature attack of Zack Fair, first appearing as his default Digital Mind Wave in Crisis Core -Final Fantasy VII-.