Although it might be good to be aware that you shouldn't remove a weapon from your mental arsenal just because it's labeled "dark arts". Sure, you should be one heck of a lot more reluctant to use them, but if you need to shut up and do the impossible really really badly, do so - just be aware that the consequences tend to be worse if you use them.

After all, the label "dark art" is itself an application of a Dark Art to persuade, deceive, or otherwise manipulate you against using those techniques. But of course this was not done lightly.