I know this has been talked about a little but just wondering if anyone has come across any other missing skills...
There is a paragon skill that is not an elite nor available at any skill trainer. The only enemies I have seen use it are when you are in the Hidden City Mission and come to the area where you have to solve a puzzle by choosing two columns to put the stones in.
It's called Quake (something.) Either it should be changed to a monster icon I think (it clearly has a Paragon skill icon) or put into the skills that paragons can buy. Personally I really want it. It knocks down enemies within earshot I believe. Sorry I didn't get a picture.