Offensive Spectres:

Solar Guard
https://poedb.tw/us/mon.php?n=Solar+Guard
3 Projectile base Fireballs with explosions

Scinteel Synthete
https://poedb.tw/us/mon.php?n=Scinteel+Synthete
Lightning based projectiles

Baranite Sister - Red Conqueror
https://poedb.tw/us/mon.php?n=Baranite+Sister
Lightning dmg Magma Orb-esque ability

Redemption Sentry - Blue Conquereror
https://poedb.tw/us/mon.php?n=Redemption+Sentry
Exploding phys projectiles with 75% converted to cold

Cannibal Fire-eater
https://poedb.tw/us/mon.php?n=Cannibal+Fire-eater
AoE Spell Incinerate

Frost Sentinel
https://poedb.tw/us/mon.php?n=Frost+Sentinel
3 Projectile base Ice-Spear (No fork/explosion or Pierce)

Baranite Thaumaturge - Red Conqueror
https://poedb.tw/us/mon.php?n=Baranite+Thaumaturge
2x Abilities:
Lightning based projectile (No fork/explosion or pierce)
Lightning Mines Big AoE, Spell Echoable super burst boss dmg

Slave Driver
https://poedb.tw/us/mon.php?n=Slave+Driver
AoE Spell Lightning dmg AoE

Scale of Esh
https://poedb.tw/us/mon.php?n=Scale+of+Esh
Meh

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Defensive/Utility Spectres:

Undying Evangelist
https://poedb.tw/us/mon.php?n=Undying+Evangelist
Proximity Shields

They of Tul
https://poedb.tw/us/mon.php?n=They+of+Tul
Defensive aura 15% dmg reduction as well as 20% dodge to both atk & spells
100% possible uptime

Utility Spectres:

Carnage Chieftains
https://poedb.tw/us/mon.php?n=Carnage+Chieftain
Generates Frenzy Charges to nearby allies

Host Chieftains
https://poedb.tw/us/mon.php?n=Host+Chieftain
Generates Power Charges to nearby allies

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Cursing Spectres:

Death Bishop
http://poedb.tw/us/mon.php?n=Death+Bishop
Frostbite Cursing

Ash Prophet
http://poedb.tw/us/mon.php?n=Ash+Prophet
Flammability Cursing

Reanimator
http://poedb.tw/us/mon.php?n=Reanimator
Enfeeble Cursing

Mortality Experimenter
http://poedb.tw/us/mon.php?n=Mortality+Experimenter
Temporal Chains Cursing