How to Destroy the Thorny Cyst

Thorny Cyst is a mini boss found beneath the Mont Esus East in Genshin Impact Version 4.1. See how to destroy the Thorny Cyst, as well as how to get to its location, rewards, and achievement!

How to Get to Thorny Cyst

Dive beneath Mont Esus East Diveable Hole

Dive beneath the surface of Mont Esus East near the waterfalls to locate a hole adjacent to an underwater Mek. Simply follow the tunnel until you reach a wall with Mini Meanies.

Fontaine Underwater Map Guide

Destroy the Wall Using the Xenochromatic Jellyfish Ability

To destroy the wall, absorb the Xenochromatic Jellyfish's ability and launch it towards the wall.

Xenochromatic Jellyfish Guide

How to Destroy the Thorny Cyst

Absorb the Xenochromatic Jellyfish Ability

The Xenochromatic Jellyfish Ability will be your primary way of dealing with the Thorny Cyst, so make sure to absorb one before confronting it.

You'll find one when you enter the Thorny Cyst lair, but it's rather far away, so it's best to absorb the one in the tunnel before approaching the lair.

Keep Track of your HP

When you enter the Thorny Cyst lair, your HP will begin to deplete over time, so keep an eye on it. There will be Recovery Orbs scattered throughout the lair, so make yourself aware of where they are so you can easily find them.

Make Use of Lynette's Passive

Characters such as Lynette can track the location of Recovery Orbs and display it on your mini-map, which is highly useful in this fight.

Remove the Glowing Roots

Blast the glowing roots using the Xenochromatic Jellyfish Ability to remove them.

At the start of the encounter, the Thorny Cyst will summon about ten thorns, each with its own root that you must remove. Keep an eye out for the glowing roots since those are the ones you can destroy; each round will have a different set of glowing roots.

Remove the Roots before they Change Place

If you failed to remove the glowing roots straight away in the last round after practically all of them have been destroyed, they will change place.

Destroy the Thorny Cyst

After dealing with the glowing roots, you may now deal with the Cyst itself, which is similar to dealing with the glowing roots in that you just blast it with the Xenochromatic Jellyfish Ability.

You can only damage the Cyst so many times before it becomes invulnerable, prompting you to deal with the roots again. This method will be repeated until the Thorny Cyst is destroyed.

Avoid Fighting the Fontemer Aberrants

Fontemer Aberrants will appear in each round. It is not recommended to deal with them because it may take longer, which is undesirable because your HP will continue to decrease over time.

You can easily avoid them because they only spray water bubbles at you, which most of the time do not hit.

Thorny Cyst Reward

Luxurious Chest and Mysterious Ore

When you destroy the Thorny Cyst, you will receive a Luxurious Chest and one of the seven Mysterious Ore.

Mysterious Ore are ores that can be converted into Arkhium Stocks and used to unlock Bravais' Secret Study. More information can be found in the guide below.
All Mysterious Ore Locations and How to Use

Thorny Cyst Information

Mini Boss in Mont Esus East

Thorny Cyst is a mini boss found in an underwater tunnel beneath Mont Esus East. Destroying the Cyst will grant you the Mysterious Ore as well as the “Break the Time Zone" achievement.

There is also a Hydroculus floating in the boss area, so make sure to grab it.

Genshin Impact Related Guides

Fontaine Map Guide

Fontaine Area Map Guides

Related Fontaine Map Guides
Liffey Region	Fontaine Research Institute
Fortress of Meropide	Merusea Village
Narzissenkreuz Ordo	Erinnyes
Morte Region	Tower of Gestalt
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Fontaine Exploration Guides

Fontaine Exploration Guides
Diving Mechanic Guide	Underwater Area Guide
Fontaine Commission	Fontaine Reputation
Fontaine Craftable Weapons	Pneuma and Ousia
Local Legends	Xenochromatic Creatures
Ancient Symphony

Significant Fontaine Location Guides

Fontaine Location Guides
Hydroculus	Fountain of Lucine	Shrine of Depths	Enigmatic Page
Teleport Waypoints	Treasure Chests	Remarkable Chests	Secret Treasure Map

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Rainbow Rose	Lumidouce Bell	Romaritime Flower	Beryl Conch
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Tidalga	Marcotte	Pluie Lotus	Bulle Fruit
Condessence Crystal	Ancient Key	Drained Conch Cup	Mysterious Core
Hydro Sigil	Strange Part	Key to Some Place	Credit Coupons
Energy Concentrating Component	Mysterious Ore	Arkhium Ore	Arkhium Lumenite
Spur Gears	Welfare Meal	Handwheel	Punched Tapes
Foggy Forest Branch	Simple Vault Key	Autumn's Map	Rocky's Map
Liam's Map	Rouge's Map	Barrow Map	Parker's Hopes Map
Athos Map	Freeman Map

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Fontaine Domains Guides
Denoument of Sin	Echoes of the Deep Tides
Pale Forgotten Glory	Waterfall Wen
Faded Theater

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Fontaine Quest Guides

Ancient Colors Quest Chain
A Brush of Seafoam and Crimson	A Gradient of Dreams and Ochre
Blue Longing of Heart and Moon
Ann of the Narzissenkreuz Quest Chain
The Narzissenkreuz Adventure	Kingdom Through the Looking-Glass
“If She No Longer Dreams of You...”
Unfinished Comedy Quest Chain
Game of the Rich	An Eye for An Eye
Hereafter...	Scenes From Life in Meropide
In the Wake of Narcissus Quest Chain
Search in the Algae Sea	Muse's Mother
Meteoric Lance	Cupid's Lover
Thalia and Melpomene	Savior's Wake
Waking From the Great Dream	Rowboat's Wake
The Wild Fairy of Erinnyes Quest Chain
Foggy Forest Path	Wilting Weeping Willow
Furious Mouth of the Spring	Within the Depths of Erinnyes
Questioning Melusine and Answering Machine Chain
Vagrants and Scamps	The Red and the Black
Questions and Answers
Canticles of Harmony Quest Chain
The Shadow Over Petrichor	Underwater Nocturne
The Last Day of Remuria	Gradus ad Capitolium
Fortune Plango Vulnera	For Yesterday and Tomorrow
Erinnyes Region World Quests
Impromptu Poem of the Crimson Dawn	Free Verse
Morte Region World Quests
Wish-Fulfilling Treasure Hunt
Liffey Region World Quests
In Search of Lost Time	Our Purpose is in Another Canal
Both Brains and Brawn
Fontaine Research Institute Region
Fontaine Research Institute Chronicles	Road to the Singularity
A Letter	Treacherous Light of the Depths
Villains	An Expected Plan
An Expected Lie
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Still Mouthwatering!	Truly Mouthwatering!
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Book of Esoteric Revelations	Echoes of the Ancient World
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A Certain Trifle	A Certain Stamp
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Pahsiv Shop	Decode This Level's Puzzle
Mary-Ann Brainstorming Answers	Salvage the Lost Items
Looking Glass Locations	Permingeat's Questions and Answers
Contaminated Bacterial Mats	How to Solve Dew Bubbles and Branches
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Floating Crystal Flowers and Platforms

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4.1 Fontaine Features
Searchlight's Detection Range	Gear Drain Valves
Recover the Condensing Components	Central Laboratory Ruins Seelie Puzzle
How to Destroy the Thorny Cyst	How to Go to the Abandoned Production Zone
How to Solve the Forging Press Puzzle	How to Unlock Bravais' Secret Study
Strange Eels	Allogravity-Condensed Water Bodies
Red Meanies	Stabilizer
Drive Valve to Supply Warehouse 1	Flying Energy Thief
Experimental Focusing Mirror Puzzle	Cipher Letters
Energy Transfer Terminals	Fixed Storage and Energy Transfer Device
How to Retrieve All 4 Replica Anchors	How to Start the Optical Device
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4.0 Fontaine Features
Fontaine Aquabus Guide	Court of Fontaine Waypoints Unlock Guide
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Miraculous Hydrograna	Beastly Rifts
Bullet Barnacles	Fontaine Aircrafts Guide
The Prism in Elynas	Water Volume Detection Crystal
Pneumousia Relay Guide	Pneumousia Storage Box
Sunken Objects	Scenic Attractions
Adjust the Prism	Berrypuff Hidden Quest
Locked Underwater Dome	Break the Treasure Seal
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Emperor of Fire and Iron	Icewind Suite	Millennial Pearl Seahorse
Experimental Field Generator	Hydro Tulpa	Statue of Marble and Brass
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Fontaine Enemy Guides
Fontemer Aberrants	Tainted Hydro Phantasm	Breacher Primus
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Local Legends Guides
Iron Viscount	Fairy Knight Twins	Ocean Circuit Judge
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Rocky Avildsen	Mageblade Corrouge	Chassanion
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All Interactive Map Guides