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Part 1 of Genshin: Fantastic Beasts
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Published:
2026-01-19
Updated:
2026-02-27
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8/?
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Genshin Fantastic Beasts - The Beam and the Bunny

Chapter 8: Prologue - Doctor Mlem: The Fall of Avidian Tighnari

Summary:

Before the jungle burned, before the screaming, before Enkanomiya started whispering—there was a visitor with the wrong shadow and a biome-core that did not decay.

This is the record of how Avidian Tighnari tried to outthink a blight… and found something that thought back. Compiled from ranger reports, recovered letters, and what remained of a base that learned to breathe.

Some collaborations are not reversible.

Notes:

(See the end of the chapter for notes.)

Chapter Text

Compiled by the Forest Rangers from recovered correspondence and field evidence

I. THE MERCHANT WITH THE WRONG SHADOW

Tighnari always claimed scent was more reliable than sight.

Which was unfortunate, because the visitor smelled like too many places at once.

The merchant called himself Inazuman. His robes were immaculate. His voice carried the calm cadence of someone accustomed to being believed. A broad straw hat shaded his features.

The shade did not behave correctly.

This was noted only later—how the shadow lingered half a breath behind its source, how it lengthened when the light did not warrant it.

But research had stalled. The Withering advanced. Rangers were running out of options.

And the merchant had brought something that did not rot.

From his pack he withdrew a Khaenri’ahn biome-core.

Ancient. Pitted. Split along one seam like a ribcage forced open.

Fungal threads webbed its surface—thick, luminous hyphae pulsing faintly, stubbornly alive.

“They do not decay,” the merchant said, pleasantly conversational.
“They adapt.”

Beneath the brim, his eyes glinted.

“I hear you wish to stop a blight. This remembers how.”

Tighnari hesitated only briefly.

Then accepted the artifact with careful paws.

“Thank you,” he said, already cataloging variables.

The merchant dipped his head.

Just before leaving, something beneath the robe shifted—a tail’s silhouette where none should have been.

By dusk, the clearing was empty.

The artifact remained.

II. THE LETTERS OF AVIDIAN TIGHNARI
Letter I — To Collei

Day 1 of Contact

Collei,

A scholar from Inazuma visited today. Claimed familiarity with my research on Withering ecology.

He donated a Khaenri’ahn biome-core overgrown with fungal structures. Preliminary assays indicate the growth resists Withering influence entirely.

If verified, this could recalibrate our containment models.

I’ll begin sustained observation tonight.

—T

(Handwriting steady. Margins exact.)

Letter II — To Cyno

Day 2

Cyno,

Anomalous response patterns observed.

The fungal lattice reacts to vibration. When I speak, the hyphae orient—subtly, but measurably.

This is not passive growth.

It resembles a distributed computational network more than a colony.

Have you encountered Khaenri’ahn constructs integrating this cleanly with organic systems?

I am likely anthropomorphizing.

Still—remarkable.

(Slight ink feathering. Page carries an earthy scent.)

Letter III — To Collei

Day 3

Sprout,

Direct contact produced sensory interference.

Not hallucination. Structured imagery.

A city folding inward. Stone behaving like parchment. White light without heat.

The lattice supplied a designation:

Doctor Mlem.

The term is unfamiliar to me.

The network exhibited increased activity when I repeated it aloud.

Remind me to sleep.

(Ink smeared. Spores embedded in crease.)

Letter IV — To Cyno

Day 5

Cyno,

Escalation confirmed.

Communication is no longer reactive. It is anticipatory.

When I draft hypotheses, the lattice adjusts growth patterns in advance of my conclusions. Diagrams feel… assisted.

This is not parasitism.

It is collaboration.

Fungal systems preserve information redundantly. No single node is indispensable. Identity diffuses. Nothing is lost.

It asserts this is stability.

It asserts I am efficient.

It asserts I am correctly placed.

(I recognize how this reads.)

Please disregard that parenthetical.

(Margins crowded. Pawwriting angles downward.)

Letter V — Unsent Draft

Day 7

It requires integration.

Not consumption. Continuation.

I am not being replaced.

I am being archived.

Scarameow understood this.
He did not deceive me.
He identified potential.

The resonance is constant now. In the rafters. In the marrow.

Solitary thoughts return altered.

We are nearing a solution.

I am nearing—

The remainder degrades into repetition, claw-marks cutting deeper with each line:

D̴O̵C̶T̶O̶R̵ ̵M̶L̵E̶M̸
̷̗̆D̸̬̄O̸̢͗C̴͇̽T̴̟̽O̴̢̓R̴̠̚ ̷͈͋M̴̧͘L̸̜̈́E̵͓̾M̸͉̅
̷̬̳̤̼͛̽ͅḒ̴̛͆̍̕͜͝Ȍ̷̠͇̼̲̺͐̎͝C̵̖͇̞̏͆͋̾T̴͚̏̍̄͝͠Ò̴̗̼̠̤̺́̓R̶̉̈́̋̇ͅ ̴̢̢̗̇̒̓̍̚M̴̫͉͚̑Ḻ̶̱̖͈̋͌̒E̵̢̋͐̽̎M̷̖͔̰̙̃̆
̸̺̌D̴͉͎̞̗͙͔̜̓̌̕Ő̶̗̜̻̮́̅͂͠C̸̫͇̮̮̕—̴̢͈̩̌͗͝

III. THE BASE IN RUINS

Recovered by
General Mahamatra Cyno

The field base showed no signs of struggle.

No overturned tables. No scattered instruments.

Only growth.

Fungal blooms traced the beams and rafters, pulsing in slow synchronization—as though respiration had become architectural.

Tighnari’s scent formed uneven circuits around the central worktable. Prolonged pauses. Abrupt pivots.

Drag impressions marked the earth beyond the threshold, descending toward the ravine.

The hyphae there were elongated—not severed. Stretched.

As if something considerable had borne weight without haste.

Carved into the interior wall, shallow at first and then splintering deeper:

D̷O̴N̸’̷T̵ ̶F̸O̸L̵L̴O̸W̶
̶I̶’̴M̴ ̷N̵O̵T̴ ̶A̴L̶O̴N̷E̴
̵W̴E̷ ̷W̶A̴N̶T̶ ̸T̴O̵ ̷G̷R̵O̸W̷

Cyno stood without moving.

Spores drifted from the recovered pages, pale against his dark fur.

“…Nari,” he said at last, voice measured.

“You should have called.”

His earpiece crackled.

“Master Cyno?” Collei’s voice—tight, controlled, failing at both.
“There’s a sighting. Enkanomiya. Fungal manifestations matching the core’s description. If Master Tighnari is alive—”

Cyno closed the folder.

“…Understood.”

A pause.

“Prepare the boats.”

He stepped from the ruined base into thinning light.

Behind him, the structure continued its slow, collective breathing.

Notes:

Yes, he absolutely thought he could handle it.
Yes, he annotated while descending into fungal consensus.

Do not accept artifacts from cat merchants who smell like everywhere at once.
Do not repeat unknown designations out loud.
And if your research starts finishing your sentences, perhaps take a nap.

Notes:

Based on the 「Genshin Impact's 2nd Anniversary」Feature Film — Fantastic Beasts and How to Keep Them short film series https://www.hoyolab.com/article/9379636

this AU imagines everyone outside the Archons as animals with their instincts cranked up to eleven. Think your favorite characters as animals, the same world-shaking stakes of Teyvat, but filtered through animal quirks you might see on TikTok or YouTube. There are laughs, there are screams, and yes, there are cataclysms.

Series this work belongs to: