[Rough]

I agree with maxing wraith shell, with 70% dmg absorption yout LK will be nearly immortal.

the following is just my own opinion:
I advise you to remove all the points from arcane blast. it costs a lot of energy to your LK and does not very much damage. besides, you probably noticed that, actually there are only 2-3 blasts hitting the enemys (out of 5).

with arcane blast my LK always ran out of energy, so he couldn't do soul blight, which is in my opinion far more important. it reduces enemys life by 33% (arcane blast does about 200dmg) and it hits all nearby monsters, so with one soul blight attack your LK could hit 5-6 enemys easily at one time.