about PoB level 2....ELUSIVE is so much better than ruthless and it even costs 1 AP. That skill in my opinion is so strong that im surprised it is just 1 mere AP.
with elusive you can safely disengage from 1-2 units (especially if you used the defensive stance)) and point whatever squishy target you want to kill.
One of the reasons PoB > GG is because of elusive also.
about guides...the game is still in beta and i doubt there are any guides available. I remember Aisu writing something about the 200 AP bracket for lions and you can find the the bla bla & off topic section the list i and skydancer use for undeads at 400 AP (well i play it in 300 AP but the core is the same)