This Build isn't designed for massive AOE damage but i believe can be very effective if employed correctly.

The situation will go something like this,
-Encounter a group of enemies.
-Launch a pack of 8 dagger wielding meat shields. (Fetish army (Legion of daggers))
-Throw down a Grasp of the dead (Unbreakable Grasp) for an 80% slow! Not only does this make them easier to kite, but also reduces their damage by slowing the rate at which they attack you and your fetishes.
-Quickly launch 5 Haunts (Consuming spirit). Not only is this a fire and forget DOT that does 575% weapon damage; it also heals 155 Life per second. When 5 haunts are employed 155x5 = 775 life per second. 755x12 seconds 9060 life per volley of haunts. Giving a substantial amount of survivability. You can cast this, do damage AND heal with out pressing a button.
-Unleash a flurry of Spirit barrages (The spirit is willing) to any high priority targets such as summoners, aura enchanted, ranged enemies ETC.
-If you get swarmed or need some extra health, strategically place yourself behind your fetish army (Or dont) and use Soul Harvest (Siphon) for a nice 2170 life per monster harvested 5 monsters = 10850 life.
-If you have a real oh sh*t moment or are just in need of some mana you can Spirit walk for a nice 30% mana recovery and then float over to some distant health globes before you return to the real world to repeat the cycle

Passives:
-Grave injustice, by end game you should have some Bonus to GoldGlobe radius making this spell extremely effective at reducing your cool down on your skills and a small mana and healing bonus to boot.

-Gruesome feast also benefits from your health globe radius as well making it easier to passively be picking up health globes so more focus is on surviving and effective spell rotation. Each health globe will give you 10% mana and 10% intelligence up to 50%. 50% of endgame intelligence is some serious damage potentially 500+ intelligence at full effect. you can see why this is better then pierce the veil.

-Rush of essence synergizes well with 4 of your spells returning 30% mana cost over 10 seconds . But in particular Spirit barrage. Spirit barrages mana cost is 108 mana but the spirit is willing rune returns 44 mana every time it hits. effectively making this spell cost 64 mana. Rush of essence returns mana on the 108 mana cost not the 68 mana cost. 30% of 108 = 32 mana returned over 10 seconds. 44+32= 76 mana returned per cast. 108-76= effective cost is 32 mana a cast for a no cool-down, long range, single targetable, 190% Weapon damage spell!