mist attacks.

[Dell]

(SPOILER)Quickenings can be accessed from Mist command.
Quickening is for chaining. More combo you get, more damage is dealt.

In order to chain, you must look for Triangle button, Square Button and O Button, whenever you see it, press ASAP. If you don't see any of the above, press R2 (Rapidly), and the button will appear (Not always, so you have to press more for it to appear), press it!!!!
Sometimes, you see Mist Charge instead of the Quickening Name, that is also a Quickening.
Quickening is very strong. I managed to chain 9 hit and that kill Belias and Vossler immediately!!!