[Growing Power] allows this build to hit 90% damage reduction from [Shield Of Shadows].

[Ore Gaze] could be used instead of Greedy Pull. Energy will be a concern if you don't have Arcane Energize or energy restores.

Tips: Re-casting Shadows of the Dead heals your pets to full. Energy should be plentiful with Pull. [Sancti Magistar] or [Hirudo] can heal [Nekros] if the health orbs aren't keeping up.