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.

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