You gotta try chaining the quickenings! You will get some killer finishing moves by that

Quickening Combos

Also known as Concurrences. Depending on how many quickenings chained you can obtain one special attack, called Concurrence. Those are the finishers you get at the end of a quickening chain, if you fulfilled certain conditions. Note: Pulling off every concurrence unlocks Judge Gabranth in the Sky Pirate's Den.

* Inferno - 3x level 1 quickenings
* Cataclysm - 5x level 1 quickenings
* Torrent - 2x level 2 quickenings
* Windburst - 5 x level 2 quickenings
* Whiteout - 5x level 3 quickenings
* Arc Blast - More than 2 hits on each of the 3 quickening levels
* Luminescence - More than 3 hits on each of the 3 quickening levels
* Black Hole - More than 4 hits on each of the 3 quickening levels