Was looking at some of the new NF skills and thought the following looks extremely promising:
1- Awaken The Blood
2- Rip Enchantment
3- Ravenous Gaze (E)
4- Vampiric Gaze
5-8 utility skills
The life sac of Rip can be controlled with the points you put in curses. The total life sac under AtB, should be about 55-60%. Follow immediately by RG to give close to 150 life steal, and then finishing off with Vamp Gaze for about 70 additional life steal. The chain Rip/RG/VG should take about 4.5s to complete and result in full life recovery on a 450-ish health character. If a team situation, I doubt that 4 Necros will need VG to fisnish off the target. It's more like a self heal to follow up the spike on whatever is around.
This looks very scary esp. since you are only making yourself vulnerable for a tiny period of about 1.75s.
Ravenous Vampire
Hella Good