ok, so im writing this as im doing the Excommunicado triumph (so only class choices till e500 are Voidmancer and Exorcist), after looking about and seeing the Voidmancer guide ends at e90 and your wanting to get to the more difficult (if you have no clue what your doing e500) I have no clue how the 'earlygame' for this is since i usually go exorcist until im running the T2 Jobs also im running with 6.11 E5 memories
Figured I would write this maybe its pointless maybe it helps someone.
Either Way, good luck

remember im not a guide making pro. so to quote the medic "I have no idea" what is optimal

in order of importance your gear stats once you have the stats for your gear you mostly there

but in order from what I think is important (don't make me tap the sign)

insight
intelligence
spellcraft
wisdom
empathy
mastery
patience
dominance

so you only really need one pet and thats the void fiend and void terror

but heres what i use

Buildup

homunculus / simulacrum

Void generation

Voidfiend / Voidterror

Burst

Voidfiend / Voidterror
or
you can use Spellhound I suppose

ok so there is an assumption that you have the accumulator weapon this will help but there are what i figure can stand in if its not yet unlocked

Buildup

• Void Syphon
  
• Conjure Manabeast
  
• Summon Winged Night
  
• Conjure Primal Elemental (Ritual of Potency if you have acess to it)
  
• Ritual of Power
  
• Spell Focus

Void Gen

• Void Syphon
  
• Conjure Manabeast
  
• Summon Winged Night
  
• VoidBolt
  
• Void Prison
  
• Ebon Truncheon

Burst

• Gem Resonance (Summon Winged Night maybe if you want more clicks and have CVE GR seems to work well)
  
• Conjure Void Elemental (Summon Winged Night if you dont have CVE yet)
  
• Ritual of Power
  
• Ritual of Potency (or Conjure Manabeast if you dont have access to RoP)
  
• VoidBolt
  
• Spell Focus

Buildup

Casque Of Learning
Falconers Furcoat
Endless Poucches
The Great Journey
Falconer's Leather Wrappings
Nomadic Wrists
Falconer's Gloves
Falconer's Bottoms
The Accumulator
Habitstone
Hollow Eye Pendant
Resonator Ring
Companionship Ring
Falconer's Warm Cape
Spell Shards Fractalization
Abnormal Voidmass
Charged Fin-Wing
Blesses Tapestry

Void Gen

The Bright Beacon
Nethershell
Endless Pouches
Legacy
Chaos Mantle
Nethershackles
Netherfist
Nether Barrier
Shard Of A Lost Dimension
Pitch-black Cage
Nether Chain
Resonator Ring
Netherloop
Chaos Mantle
Void Sampling
Anomalous Essence
Insidious Lure
Blessed Tapestry

Burst

Circlet Of Deep Thoughts
Seclusion Shell
Colourful Belt
Boots Of Concentration
Tranquil Spaulders
Focusing Bracers
Talented Gloves
Mesmerizing Pants
The Accumulator
Black Vortex
Nether Chain
Resonator Ring
Spell Helix
Concealing Shroud
Destabilized Evocations
Abnormal Voidmass
Necrotic Powerstone
The Rubedo Engine

this is just what i have and is pretty much in no way optimised

152/5.11e5 memories

Memories

Forlorn Nobility 60
Restored Rituals 5
Reinvented Techniques 5
Rekindled Pride 4
Unseen Efficiency 6
Unending Resource 7
Reclaimed Methods 10
Adapt Quickly 10
Planned Progress 20
Deja Vu 20
Veterancy 20
Recalling Power 20
Remembering Complexity 10
Reborn Servants 7
Lost Reserves 1
Forefathers' Work 10
Brazen Ambition 5
Innate Aptitude 10
Timeless Fame 12
Forlorn Purpose 1
Foreseeable Results 1
Cognative Resonance 5

Imprints
Expanded Mind 10
Swift Recalling 5
Engineered Ancestry 3
Green Spectrum Synthetics 2
Blue Spectrum Synthetics 1
Red Spectrum Synthetics 1
Headstart 3
Memories Within Memories 18

the Idle wizards discord who sort of helped me cobble this monstrosity you can call a build together (though not that much direct advice more that doesn't work or you should focus on this)

those who read the guide

and to the commentors

Maslow