Quickenings can be a lifesaver and make the game a heckuva lot easier once you get them down-packed. I took down the Boss on the Leviathon (someone please tell me how to mark spoilers...or what color it is? Please?) and then later on when you have to face a certain...wall, while looking for the Dawn Shard.

Oh, and I was about level 11 for the fight and killed the boss in 2 Quickening hits.