Curses: 15 (11+3+1)
Blood Magic: 13 (12+1)
Soulr Reaping: 7 (6+1)
Curses: Feast of Corruption (elite), Shadow of Fear, Parasitic Bond, Enfeeble, Faintheartdless
Blood Magic: Vampiric Gaze
Other: Arcane Echo, Ressurection Signet
Weapon and Armor:
The best choice for armor is Scar Patterns because they add bonus energy which is quite important in this build.
For weapon use Staff with bonus to energy and HP. Staff should have "Improve skill cast/recharge using Curses".
How to play:
First word about Vampiric Gaze. This skill is only for fast healing yourself and/or for fast killing when foe has small amount of life.
Use Enfeeble on Warriors so they couldn’t inflict too much damage.
Power of this build relays on Feast of Corruption that deals 120 shadow damage (before armor) on area. But it needs some hex on foe to be fully powerful. So we have here Parasitic Bond for fast hexing and Faintheartedness. Use them on targeted foe. If around this foe are other foes then use Shadow of Fear.
After preparations mentioned above use Arcane Echo and Feast of Corruption. You will see many numbers around foe's heads. And to make them even worse cast Feast of Corruption from Arcane Echo. That should show them. :)