Level 94 Summon Raging Spirit Necromancer^3.21

Notes

Animate Guardian gear:
Note: You need 35% elem resist and 55% chaos resist to res cap your guardian.
Get a level 20 Animate Guardian Gem so it doesn't die.

Cheap gear:
Leer Cast - gives you 50% increased damage
Sentari's Answer - cheap easy curses (sometimes)
Belly of the Beast - Defenses to keep him alive
Sign of the Sin Eater - prevents elemental ailments when you guardian is nearby
Rare boots with chaos resist
Rare gloves with unnerve on hit and chaos resist

Alternatives:
Windscream boots plus gloves with curse on hit (to apply additional curse)
Legacy of Fury - for scorch

There are many other alternatives, so look for animate guardian gear guides and play with it.


Spectres:
You can get spectres by posting in global 6666
Pale Seraphim - gives enemies increased damage taken. Found in Beyond mobs, looks like a man-spider with legs poking out of his back. 
Carnage Chieftain - grants you and minions frenzy charges. Found in Act 2 or 6 jungle areas, big monke.
Arena Master - grants you move speed and cast speed. Found in Drox influenced maps.

Other option I didn't try (let me know if they are good):
Tukohama's Vanguard - gives fire exposure. Found in Act 6 Tukohama area. We already apply exposure with Elemental Army so probably redundant.
Xoph's Loyal - Covers enemies in Ash. Found in Breach.

Other Notes:
- Elemental Army on Zombies/Spectres won't deal fire exposure unless you add "minion deal X to Y fire damage" somewhere. Here I have it in my wand's crucible tree, could be on a jewel or other gear.
- Good crucible nodes: Minion Life, minus minion chaos res (so your raging spirits die faster), minion chance to ignite, minion damage, Eldrich Battery if you wanna splurge.
- Use the "Find Timeless Jewel" function in PoB to find an Elegant Hubris with as many Minion Life nodes as possible, and some Life or Spell Suppress. This is the most expensive item, 1-2 divs.
- Eldrich influences are just random stuff I spammed, not necessarily good ones.
- Trigger spell on wand with Desecrate, Bone offering, and Lifetap is SUPER important for survivability, gives us perma Bone offering buff which caps our block and gives tons of life regen.