Here's a list of commonly used Spectres and their roles:

1. Redemption Sentry
Role: High DPS / AOE Damage Dealer

Why Use Them:

Redemption Sentries are one of POE2 Currency the top choices for high AoE damage. They deal massive damage across a wide area, which is ideal for clearing large packs of enemies.
They also provide additional elemental damage through their fire attacks, making them excellent for fast-paced farming or high-speed clears.
Can be very effective in bossing when used alongside minions that tank damage.
Key Features:

Fire-based AoE attacks
Strong single-target damage as well, making them versatile
Great for speed farming
2. Solar Guard
Role: Tank / Crowd Control / Defense

Why Use Them:

Solar Guards are a popular choice for those looking for defensive Spectres. They have decent tankiness and deal moderate damage, while also providing crowd control abilities that slow and disable enemies in a large radius.
They can act as a frontline defense, absorbing damage while your other Spectres and minions deal damage.
Key Features:

AoE slowing effect, which reduces the movement and attack speed of enemies
Solid tanking capabilities for absorbing damage
Good support for other minions in the backline
3. Carnage Chieftain
Role: Support / Buffs Minions

Why Use Them:

Carnage Chieftains are excellent for boosting minion damage, especially in a minion-centric build. They can provide buffs to nearby minions, significantly increasing their offensive capabilities.
Ideal for builds focusing on minion synergy where your Spectres and other minions need a damage boost to maximize overall DPS.
Key Features:

Increased minion damage buffs in a wide area
Supports other minions, making them invaluable in minion-based builds
Great synergy with minions that have high base damage output
4. Host Chieftain
Role: Buffs and Utility / Support Minions

Why Use Them:

The Host Chieftain is a support Spectre that boosts other minions’ speed and damage through its aura and ability to summon totems. It also increases survivability for your minions.
Host Chieftains work well in builds that require minion synergies, offering buffs to cheap Path of Exile 2 Currency make your army of minions more formidable in combat.