Life stealing build

I am a new Necro,so I don't know if any1 made this build,but when I looked at all necro skills,I made this build:

Blood Magic: 14 ( 11+1+2 )
Death Magic: 14 ( 12+2 )
Soul Reaping: 6

build:
Blood of the Aggressor-Dark Pact-Touch of Agony-Taste of Pain-Dark Aura-Vampiric Spirit-Blood Renewal-Optional

optional skills: Res,don't know what can be other (you don't need res in AB)

with this build I am doing very good damage,about 130 at 1 hit if I am near target,and if target is not surrendet with some1 else (Vampiric Spirit....it steals randomly)

I like this build because very good damage.
Maybe there are better Necro builds,but this just work fine for me.
I have 550 health

so,what you think?

I would drop Touch of Agony and take Signet Of Lost Souls or Consume Corpse.

Touch of Agony is a skill, will not work with Vampiric Spirit. You also have low amounts of Soul Reaping (missing rune?), and energy management problems from Vampiric Spirit can be costly.

You have a weapon & off hand and vigor to give you that much health? Sacing does more damage to you than you can heal from VS. Remember, Blood Ritual will drop your health by 1/4, even with VS, DA will cause additional damage, so you have to use it carefully.

I think e-management is your biggest concern.

A condition removal may help you in your optional slot (Plague Sending, not touch). Sac, spell, spread 1 condition to adjacent foes of target (if you are surrounded, it becomes a nice skill to use).

Just a suggestion.

this is a small variation on the old Dark Aura build, but I'd never run a Dark Aura build without either /D for Mystic Regen or /A for Prison.