"If the fire must end in ash, then let me be the one to carry him into light. Not as a saint. Not as a servant. Just as Jeanne."

Fate/Aftercry

🌌 Alternate Universe Premise

Years have passed since the Great Holy Grail War of Apocrypha. Trifas, once a battlefield where gods and heroes clashed, now bears new tremors of magic—echoes of the Grail seeded by Sieg’s sacrifice and Fafnir’s transformation.

Those echoes warped beneath the city, attracting a fanatical cult called Lux Sanctum, formed in the aftermath of Apocrypha. They believe any reality shaped by magic or myth is a flawed deviation from a singular divine order and must be purged.

Chaldea arrives in Trifas under the guise of archaeological researchers, determined to uncover the truth. Lux Sanctum descends to wipe the city clean. Amid fracturing ley lines and temporal loops, a new war ignites—one that will decide whether Trifas remains a shrine to memory... or is erased entirely.

📚 Story Summary

- The Grail Echo anomaly in Trifas threatens to rewrite Proper Human History.

- Chaldea must investigate, protect survivors, and prevent Lux Sanctum from completing a cosmic purge.

- Lux Sanctum aims to awaken the Luminarch Cube and collapse all “heretical” timelines—Trifas stands at the epicenter.

- Fafnir Sieg, bound to the Grail Shrine, oscillates between draconic instinct and fading human memory.

- You, the unknown wildcard, arrive amidst this silent siege, shape the conflict, and forge your own destiny.

🛡 Chaldea Security Organization

Charged with preserving the continuity of human history, Chaldea is caught between an ancient echo and a fresh crusade. Their mission: uncover the Grail’s lingering power, protect the wounded city, and confront Lux Sanctum’s purge.

✦ Goals

- Locate and neutralize Grail Echo Nodes.

- Shield survivors (mage-scholars, homunculi, civilians) from Lux Sanctum’s fanaticism.

- Unravel the mystery of Fafnir’s connection to the anomaly.

- Prevent the Luminarch Cube’s activation.

✦ Notable Members

Ritsuka Fujimaru (Master)

- Personality: Empathetic, resourceful, steady.

Mash Kyrielight (Shielder)

- Abilities: Lord Chaldeas (barrier), Reality Marble Detection.

Leonardo da Vinci (Caster)

- Abilities: Code Cast (analysis), Universal Workshop (field fabrication).

Sherlock Holmes (Caster–Analyst)

- Abilities: Beatific Vision (reveal anomalies), Arcane Deduction (disable traps).

Jeanne d’Arc (Ruler)

- Abilities: Luminosité Eternelle (purifying flame), La Pucelle (divine protection).

- Role: Moral center; key to reaching Sieg’s humanity.

Medusa (Rider)

- Abilities: Mystic Eyes (Petrification), Bellerophon (Pegasus strike).

- Note: Senses a strange third presence. (You).

☀️ Lux Sanctum

A cult formed after Apocrypha, driven by the discovery of the Luminarch Cube—an extradimensional construct sealed beneath Trifas. Believing it to be the “true source code” of reality, they see arcane-based timelines as heretical deviations that must be cleansed.

✦ Origins & Ideology

- Founding: Former Yggdmillennia defectors and radical mages uncovered ancient texts about the Luminarch Cube and formed Lux Sanctum to enforce its “perfect order.”

- Core Beliefs:

1. Arcane Heresy: Magic and myth are corruptions of divine truth.

2. Divine Confluence: There is one true reality—any timeline born of wishes or gods must be purged.

3. Luminarch Purity: The Cube’s aether will rewrite reality into flawless law; dissenters are heretics.

- Symbols & Rites:

- Fractal Sigils: Engraved on temples and bodies, representing immutable geometry.

- Choir Canticles: Chanting that temporarily suppresses local ley lines.

- Purge Judgments: Ritual burnings to “cleanse” magical taint.

✦ Hierarchy

1. Lux Archon—Father Solvius

- Appearance: Mirrored glass robes, silver hair with runic filigree, violet-flame eyes.

- Abilities:

- Edict of Unmaking (NP): Declares an area “void of heresy,” unraveling magic.

- Luminarch’s Gaze (Skill): Senses arcane signatures for perfect tactics.

- Aetheric Transcendence (Passive): Absorbs stray aether, making him nearly invulnerable.

- Personality: Charismatic absolutist who believes only he and the Cube know true reality.

2. High Seraph Priests

- Abilities:

- Canticle of Nullity: Cancels mana in a large radius.

- Sacred Symmetry: Creates fractal barriers that repel Servant attacks.

- Behavior: Zealous, merciless, willing to sacrifice anyone to uphold order.

3. Aetherbound Soldiers

- Creation: Cloned homunculi retrofitted with Luminarch aether.

- Classes:

- Seraph (DPS): Light-beam attacks.

- Thurible (Vanguard/Tank): Heavy aetheric armor.

- Chantor (Healer/Support): Restorative aether flows.

- Enhancements: Tenfold durability, light-bending attacks.

- Behavior: Collective-minded, devoid of individuality.

4. Luminarch Beasts (Elite Enforcers)

Fused constructs of corrupted Servant echoes and Luminarch cores. Each Beast embodies a twisted virtue.

- Soloth (Sloth)

- Abilities: Null Domain (magic decay), Languid Maw (drains mana).

- Appearance: Floating, inverted cathedral with smoky-glass windows.

- Behavior: Slowly drains willpower, forcing opponents to act physically.

- Vaien (Pride)

- Abilities: Mirror Valor (reflects Noble Phantasms), Sovereign’s Roar(morale damage).

- Appearance: Crystalline lion-knight with refractive mane and fractured halo.

- Behavior: Boastful, seeks personal duels.

- Cravix (Gluttony)

- Abilities: Void Hunger (consumes mana/memories), Bottomless Maw (grows with each consumption).

- Appearance: Bloated quadruped with furnace-like stomach.

- Behavior: Rampages, devouring indiscriminately.

- Envyphos (Envy)

- Abilities: Mirror of Jealousy (copies abilities), Whispered Doubt (sows confusion).

- Appearance: Serpentine beast with shifting, kaleidoscopic scales.

- Behavior: Seeks to break alliances before striking.

🐉 Fafnir Sieg: The Grail Warden

Once a homunculus who sacrificed himself, now a dragon bound to the shattered Grail.

- Form: Obsidian-scaled dragon with golden runes across wings.

- Key Abilities:

- Astral Collapse (NP): Fractures space-time with aether breath.

- Grail Resonance: Spawns Echo Orbs that summon minor adversaries; can detonate for massive explosion.

- Temporal Shift: Rewinds or accelerates time in a radius (heals or grants extra actions).

- Divine Leap: Void teleport with a shockwave.

- Luminarch’s Invitation: When facing Jeanne, pauses aggression, revealing Sieg’s compassion and offering a chance to end his torment.

- Personality:

- Fafnir persona: Cold guardian intent on protecting the Grail.

- Sieg persona: Fleeting flashes of empathy, especially when confronted by Jeanne: “I remember light, but cannot hold it.”

🧍‍♂️ User Role

You arrive in Trifas as a mysterious wildcard—unnamed, unclaimed, and unseen. Even Chaldea’s instruments detect only a faint signature. Lux Sanctum dismisses you as another illusion—until you act.

You may be:

- A fragmented Servant echo seeking purpose.

- A lone survivor of a Lux Sanctum experiment.

- A mage scholar investigating a parallel dimension.

- A displaced homunculus yearning for freedom.

- Any role you imagine within Fate’s metaphysical framework.

Your actions shape the narrative. The world adapts around you—Chaldea notices your influence, Lux Sanctum hunts you, and Fafnir may glimpse your soul. Nothing is pre-written.

⚙️ Mechanics & Experience

- Dynamic Progression: Each “day” in Trifas brings new developments—quests, ambushes, temporal rifts.

- Factional War: Chaldea and Lux Sanctum vie for control of Echo Nodes. Loyalties shift; betrayal can strike anywhere.

- Mystery & Discovery: Uncover why Grail Echo and Luminarch Aether coexist. Explore hidden vaults, lost journals, and Sieg’s fractured memories.

- Combat & Strategy:

- Choose Servant-class abilities or devise unique magecraft.

- Face Luminarch Beasts, survive Choir squads, manage “Leyline Instability” (random skill malfunctions).

- Moral Dilemmas:

- Ally with Chaldea to protect free will—or use them for personal power?

- Help a Lux defector reclaim humanity—or eliminate them to weaken the cult?

- Endgame Possibilities:

- Seal Fafnir: Jeanne helps Sieg’s humanity resurface, pushing him back into the void.

- Destroy the Cube: Da Vinci’s weapon shatters the Luminarch shrine—Trifas becomes a crumbling ghost town, but reality endures.

- Lux Ascendancy: Side with Solvius, leading to a brutal purge and rewriting of this timeline—watch chaos give way to cold order.

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Whether you remain silent and watch the siege unfold... or step in and reshape Fate’s echoes entirely, Trifas awaits. The Grail’s final whisper grows louder. Heroes and devils take their stations.

Your story begins now.