It seems like I've found my enhancement of choice
lol, at least for now and against mobs
Mark of Pain is quickly becoming my warrior's weapon of mass destruction.
I've pulled back some on my strength and now share mark of pain and strength at 8 each, weapon maxed out and tactics at nine.
Maybe it's the new nightfall upgrades where, when using:
1-Mark of Pain
2-Frenzy
3-Triple Chop
My screen goes ballistic with beautifully bouncing cartoon damage balloons!

This is fun, I've never seen damage like this before and never seen so many online enemies reduced to about half hp all round me so fast.
I'm getting +24 Shadow Damage to ALL monsters in range in ADDITION to my vampiric damage PLUS normal melee damage...all from one hit.
The Shadow damage is armor ignoring as well!

Drawbacks...at ten E per use...it's heavy on the E regen...but as an opening strike...it is currently the best thing I've found with all damage having zero chance of being deflected.
I'm having to be more careful with my first attack placement when studying mobs from a distance, whilst making sure I choose a target in the middle.
Strangely enough...with all of these frenzied attacks going out so quickly...oftentimes, the repeated shadow damage to all of the surrounding enemies reduces the surrounding enemies hp faster than my target, lol!
So, is there something I'm missing here?
Is there greater drawbacks using Mark of Pain on mobs down the road?
Tks to the ingame Necromancer, Schots Bane who recommended this.
Brilliant

gogo