Thralls are a special global resource introduced in the Age of Wonders 4 expansion "Eldritch Realms." The way they work is similar to the standard Souls resource, but there are a few important differences.

For one, you don't get access to Thralls unless you also have access to the ritual spells that use them, and the only way to get ritual spells in Age of Wonders 4 is to have an Eldritch Sovereign hero. And while you can get access to a special Eldritch Sovereign hero in one of the "Eldritch Realms" story realms, the Thrall resource is mostly exclusive to factions led by these new ruler types.

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How to Gain Thralls

Age of Wonders 4 Enthrall Population
The Enthrall Population ritual spell in Age of Wonders 4: Eldritch Realms.

As soon as you get access to a "ritual" spell, the Thralls global resource will appear along the top border of your interface. Much like your other global resources in Age of Wonders 4, Thralls has an income per turn on the right, but you shouldn't expect to see the number change from zero.

Instead, the way you gain Thralls is by defeating enemies in combat. Any enemies will do, including undead, astral beings, and the umbral monsters introduced in the expansion. The more enemies you fight, and the more powerful these enemies are, the more Thralls you can expect to gain when you win.

Experienced players may notice that you can get Thralls and Souls the same way. Fortunately, if you have access to both the Thralls and Souls resources, you can get both of them from the same combat. Gathering Souls doesn't affect your Thrall gains, and vice versa.

There are also a few ways to get Thralls that don't involve fighting.

  • If you have the Thralls resource, you get free access to the Ritual Spell "Enthrall Population." This spell costs 30 Mana and 30 Casting Points. On top of that, you must sacrifice a Population point to get three Thralls. You can only use the spell on owned or vassalized cities.
  • If you have both the Thralls and Souls resources, you get free access to the world spells "Soul Drain Ritual" and "Thrall Effigy." "Soul Drain Ritual" costs 3 Thralls and 45 Casting Points to give you 30 Souls, and "Thrall Effigy" costs 30 Souls and 80 Casting Points to give you 3 Thralls.
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How to Spend Thralls

Age of Wonders 4 Eldritch Hero Skills
The special Eldritch Sovereign hero skills category in Age of Wonders 4.

Eldritch Sovereign heroes can't access the usual "Warfare" category of Hero Skills. Instead, they get their own "Eldritch Sovereign" category, which includes all the ritual spells that spend Thralls. When reading the list below, keep in mind that every ritual spell is a world map spell and has no use in Age of Wonders 4's combat.

Spell Name

Unlocked By

Thralls

World Casting Points

Effect

Enthrall Population

Enthralling Presence (Free)

1 Pop

30

+3 Thralls

Soul Drain

3

45

+30 Souls

Thrall Effigy

30 Souls

80

+3 Thralls

Clairvoyance Ritual

1

45

Reveals closest undiscovered Ancient Wonder or Infestation from capital

Astral Wisp Ritual

Astral Wisp Ritual

2

80

Summons Astral Wisp unit (T1) on target hex

Dark Knowledge Ritual

Eldritch Rituals

4

150

+200 Knowledge

Mesmerizing Draft Ritual

1

45

Target city gets +50 Draft for 3 turns

Phantasmal Ritual

Phantasmal Ritual (requires 2 other Eldritch skills)

2

80

Target enemy army loses 20 percent of its total HP and 3 stacks of Status Resistance during the next combat

Quickening Ritual

Quickening Ritual (requires 2 other Eldritch skills)

2

80

Target friendly army gains Very Fast Movement for 2 world map turns

Astral Siphoner Ritual

Astral Siphoner Ritual (requires Astral Wisp Ritual and 4 total Eldritch skills)

5

200

Summons Astral Siphoner unit (T3) on target hex

Mass Phantasmal Ritual

Mass Phantasmal Ritual (requires Phantasmal Ritual and 4 total Eldritch skills)

3

100

All enemy armies in target Province lose 15 percent of their total HP and 2 stacks of Status Resistance

Mage Bane Ritual

Mage Bane Ritual (requires Astral Siphoner Ritual and 6 total Eldritch skills)

10

300

Summons Mage Bane unit (T4) on target hex

Something to keep in mind is that, while several of the ritual spells summon units to serve you, these units cost Mana to Upkeep, not Thralls. Unlike the Souls needed by undead units, you'll never have to worry about disbanding units to avoid losing Thralls every turn.

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Age Of Wonders 4
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Released
May 2, 2023
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WHERE TO PLAY

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Developer(s)
Triumph Studios
Publisher(s)
Paradox Interactive
Genre(s)
Turn-Based Strategy