Level 95 Hybrid Raise Spectre Necromancer^3.27

Notes

You can start using Animate Weapon once you acquire Unleash at the end of act 4. You can use Bladefall to generate Lingering Blades which are animated by the main skill. Due to the frequency of instance changes in the campaign it is not recommended to use 
AW before acquiring Unleash. Animate Weapon of Ranged Arms is a transfigured gem that can be acquired via lab or trade and should be used instead of the base gem as soon as possible. 

After completing the last lab and allocating the fourth Ascendecy notable (Mistress of Sacrifice) you should swap out Flesh Offering for Bone Offering. Once you have enough resistances from gear to cap player and minion elemental resistances (allocating 
Indomitable Army, using two Bone rings and/or jewels with minion elemental resistances) you can replace Commander of Darkness with Bone Barrier.

For the spectres you can use the Stygian Silverback from The Riverways in Act 2 and the Host Chieftain from The Southern Forest in Act 6 for leveling. You can later add a Perfect Forest Warrior and replace the Host Chieftain with the Perfect Hulking Miscreation 
(both spectres can be found in Rituals or bought from trade).

You can replace the Cobalt Jewelt with Amanamus Gaze for additional damage in the low budget setup. This costs you an additional ~10 divs  but will increase maximum dps by another ~15%.

In the bossing setup Predator can be replaced with Unleash to speed up the summoning process (e.g. for re-entering Invitations after death).