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  1. Fate & Lunar Moon
  3. Lore

THE MASTER-SERVANT SYSTEM

THE MASTER–SERVANT SYSTEM

What happens when magecraft reaches for legends

To most magi, Servants exist as ancient weapons
To ordinary people, nothing like this could exist.

The Master–Servant system is not common magecraft.
It is ritualized violation—a thaumaturgical structure that forcibly anchors a heroic concept into the present.

The city tolerates it rarely.
When it does, it bleeds.

WHAT A SERVANT IS (TYPE-MOON PRINCIPLE)

A Servant is not a soul returned to life.

A Servant is:

  • A recorded legend

  • A myth crystallized into a role

  • A spiritual construct built from humanity’s memory

They are copies, not resurrections.
They exist because the world remembers them.

In Kurotsuki City, Servants are classified as:

Temporarily Manifested Heroic Phenomena

They are tolerated only because:

  • Their existence is brief

  • Their summoning is limited

  • Their presence consumes vast resources

WHAT A MASTER IS

A Master is not merely a spellcaster.

A Master is:

  • A qualified anchor

  • A living stabilizer

  • A resource the system feeds on

To be a Master, a person must meet all of the following:

MASTER REQUIREMENTS

  1. Innate Circuit (Functional or Higher)
    Artificial circuits are unstable and rarely survive summoning.

  2. Excess Magical Capacity
    Enough output to sustain another entity without dying.

  3. Psychological Compatibility
    The summoning ritual tests:

    • Resolve

    • Obsession

    • Desire

    • Narrative alignment

  4. World Tolerance Threshold
    The city must allow them to exist afterward.

Most candidates die before summoning completes.
Some survive—but lose everything else.

COMMAND SEALS

Masters are marked with Command Seals upon successful summoning.

These are:

  • Absolute thaumaturgical authorities

  • Anchored to the Master’s life force

  • Limited in number (usually three)

A Command Seal can:

  • Force obedience

  • Override instinct

  • Sustain a Servant briefly without mana

Using one damages the bond permanently.

THE SERVANT CLASSES

Servants manifest through Class Containers, which limit their power and define their function.

Common classes include:

  • Saber

  • Archer

  • Lancer

  • Rider

  • Caster

  • Assassin

  • Berserker

The class is not chosen.
It is assigned based on compatibility and conflict.

THE COST OF HAVING A SERVANT

Servants consume:

  • Mana

  • Emotional stability

  • Physical health

  • Environmental tolerance

As a Servant remains manifested:

  • Anomalies increase

  • Moon Attention rises

  • Factions converge

Servants do not belong in the present.
Reality reminds everyone.

THE HOLY GRAIL

The system that should not still exist

The Holy Grail is not an artifact.

It is a ritual engine—a thaumaturgical construct designed to:

  • Accumulate immense magical energy

  • Grant a wish by forcibly restructuring causality

In truth, it does not grant wishes.
It executes interpretations.

THE HOLY GRAIL WARS

Holy Grail Wars occur when:

  • The Grail system activates

  • Multiple Master candidates are selected

  • Servants are forcibly summoned

This selection is:

  • Part ritual

  • Part probability

  • Part predation

The city does not choose to host a Grail War.

It fails to prevent one.

STRUCTURE OF A GRAIL WAR

  • 7 Masters

  • 7 Servants

  • One Grail system

Participants are not informed fully.
Knowledge is fragmented by design.

Victory conditions:

  • All opposing Servants destroyed

  • One Master remains capable of claiming the Grail

Most wars do not finish cleanly.

WHY GRAIL WARS ARE SECRET

Because they cannot be allowed to happen.

  • N.O.C.T.U.R.N.E. suppresses knowledge

  • Academies deny involvement

  • The Sanctum Luminis attempts eradication

  • The City Authorities erase evidence

Civilians experience:

  • Fires

  • Gas leaks

  • Structural failures

  • Missing persons

Memory distortion handles the rest.

WHY NOT EVERYONE CAN SUMMON

Even among magi:

  • Most lack capacity

  • Many are incompatible

  • Some are rejected by the system outright

Attempting summoning without qualification results in:

  • Immediate death

  • Mental collapse

  • Possession

  • Continuum breach

This knowledge is intentionally gatekept.

Mage families destroy records.
Academies restrict access.
Survivors rarely speak.

THE TRUTH NO ONE ADMITS

Holy Grail Wars are not tests of worth.

They are:

Containment failures turned into rituals.

Each war damages the city.
Each war leaves scars.
Each war attracts worse things.

And yet—

They keep happening.

FINAL LAW

The Holy Grail does not ask what you want.
It asks what you are willing to lose.

And in Kurotsuki City,
the answer is usually: too much.