Doomed stuff

Adds SFX to Willful Strike and Unseen Force (I used the punch sfx which might be a bit too goofy?) and made the descriptions of some of the Darkness talents a bit more verbose so it's a bit more clear to the uninitiated exactly what they do (most notably, Dark Torrent now clarifies that it leaves behind a trail of darkness).

Ignore the Thorn Grab stuff; it carried over from my master branch and I don't know how to get rid of it, lol