Level 98 MoM Raise Spectre Necromancer^3.24

Notes

Raise Spectre of Transience usage:

Raise Spectre of Transience can raise additional spectres (up to 4 at max gem lvl and 20% quality) that are temporary. Unlike your regular spectre they despawn on screen transitions, worse survivability, have limited dmg due to the lack of support gems and are primarily 
used to introduce Feeding Frenzy and potentially buffs, debuffs and/or charges into the build. Feeding Frenzy comes from the support gem whereas everything else is spectre specific and thus requires a specific spectre to be raised. In order for these spectres to show 
up in your Desecrate you have to raise them using the regular Raise Spectre ability at least once. The easiest way of setting up the build is by raising a range of different support spectres with the regular Raise Spectre ability before getting your main spectres 
(the Primal Crushlaw and/or Cloud Retch) and you can find a range of useful spectres in the short list including where to find them below. It's not always possible to find good support spectres in your desecrate in certain areas or when fighting bosses so sometimes you 
will have to raise a random corpse to maintain the Feeding Frenzy buff. 

Since collision is a major issue in the build which lowers dps by preventing one or multiple spectres from attacking you should optimally only raise a single Spectre using the Raise Spectre of Transience against bosses.

Support Spectres:

1. Spectral Leader (T17 maps) - powerful action speed aura, incredibly fragile
2. Stygian Silverback (Act 2 - The Riverways) - generates frenzy charges, decent durability
3. Carnage Chieftain (Act 7 - Ashen Field) - generates frenzy charges, decent durability
4. Host Chieftain (Act 6 - The Souther Forest) - generates power charges, decent durability
5. Arena Master (Warlord influenced maps) - shortlived buff that increases dmg, attack/cast and movement speed, very high durability
6. Pale Seraphim (maps with beyond demons, followers of Beidat) - inflicts a debuff on enemies that slows action speed and increases damage taken, high durability

Main Spectres:
Primal Crushclaw - rare monsters spawned by blue plants in the Sacred Grove (Harvest)
Cloud Retch - influenced packs in Redeemer influenced maps