Item needed are:
3 Nat set:
Nat helm
Nat Ring
Nat Boot
to get the Rain of vengence bonus

3 Shadow set
Shadow pants
Shadow Chest
Shadow Glove
To get the Shadow power bonus

Bracer
Reaper warp

weapon
buriza (cause of the piercing )
quiver
Spine of seething hatred (Chakram generate 4 hatred)
belt
Goldwarp (gold convert to armor)

Gem
Boon of the hoarder (gold gold gold gold)
Pain enhancer (more pain more more)

Skill will be as seen on my profile ( lazy to type them hahahah)

but I tell you why ..
upon seeing group of mobs press RoV and gloom at the same time and start strafe.
by gaining all rune from gloom (Shadow Bonus) enermy around you got afected by slow and this proc cull the weak.
while strafing keep on pressing chakram repeatly ...cause by using Spine quiver it generate your Hatred not much, but better then nothing.
if not enough hatred use prep or pet to regen your hatred and keep moving
Reaper warp also help the hatred gain from globe .
Use RoV again and soon the cool down finish (Nat Bonus) ,it help alot for killing mobs especialy elite .
Boon gem will drop alot of gold from dead monster and gold warp will turn them into armor ,this will make you strafe into mobs group without getting mush pain.