Stupid stupid archers. So this time I got RT. Made it easily to Zone 5, and was doing really well until the commander died. Now I have to find those little red dots and kill them and next thing I know GS trigger and arrows shooting me from every direction. Try to run back to hide....dead.
Still at level 19.. try again. Got Qunari. Made it to the zone with 2 Saarebas.. killed everything but the 2 Saarebus sitting at the end of the zone. Now my CL doesn't generate enough barrier because there is only 2 of them. Basic attack alone is not enough.... dead.
Still at level 19! try again... demon! Went all the way thru nothing even remotely close enough to kill me.
So moral of the story is AW is invincible against Perilous demon. Everything else have something that could kill the AW.... at least for the low promo one. 
Have you tried this again recently, LC?
In NM, Qunari and Venatori are the hardest, but really not bad. For Venatori, just watch for immunity barrier that the spell binder guys may cast on others. Use the SB to get rid of the barrier, and then return to the chain lightning. Qunari die nicely, but the assassins will strip you of barrier which is a bit of surprise.
As someone else said, I run Spirit Blade, Chain Lightning, Stone Fist, and Frost Step.
Recently try getting rid of frost step to include Pull of the Abyss. Use PotA and when they are all nicely bunched up, you can use your SB to slice them all at the same time. Nice tactic.
Moral, though, is that spirit blade may be buffed, but it is still very useful for electric immune enemies in NM.