Clearing out the boiling hot spring water in the Beryl Region of Fontaine grants players with the Core Cooling achievement. Learn how to clear out the boiling water near the hot springs, how to get the Core Cooling achievement, and more!

How to Cool the Boiling Lake

Step-by-Step Summary

1. Go to the hot spring in Beryl Region, Fontaine.
2. Collect all the Water Volume Detection Crystals and solve the puzzle.
3. Use the Hydro Portal to the underwater chasm.
4. Unlock and activate the Hydro Totem Switch by putting Hydro Cores on altars.
5. Again, use the Hydro portal to the Iron Viscount.
6. Ride through the current behind Iron Viscount.
7. Swim ashore and go to the surface using the the Hydro Portal.
8. The spring should be cooled off now. Travelers will get the Core Cooling achievement.

Go to the Boiling Lake

First, go to the hot spring in the Beryl Region of Fontaine. The location is found in the map above.

Going into the boiling water drains your character's HP, so you can't dive in!

Collect All Water Volume Detection Crystals

You will then see a treasure chest in the middle of the hot spring. To unlock it, you have to collect three (3) Water Volume Detection Crystals scattered around the Boiling Lake!

How to Solve the Crystal Puzzle

	Objectives
1	From the Waypoint nearest to the boiling water in Beryl Region, glide towards the Armored Crab enemies to your right. Defeat them, and move the Water Volume Detection Crystal once.
2	Then, head forward until you see the Pnuemousia Storage Box to your left. Use any Ousia-aligned attack, or use the nearby Ousia Block to reveal the Detection Crystal inside. Move it once, afterwards.
3	Lastly, press forward until you see the Flaming Flower field beside a small rock formation littered with vines. Burn the vines to reveal the third Detection Crystal using Pyro. Move it once, afterwards!
4	Once all three Water Volume Detection Crystals are around the Precious Chest in the middle of the Boiling Lake, glide towards it. There are elevated areas around the lake that let you glide down the islet without scalding yourself!

Ride the Hydro Portal to the Underwater Chasm

Once you've opened the treasure chest, a Hydro portal will unlock. Ride the portal and you will be transported to an underwater chasm. Go to the surface and you'll see a cave with a hot, lava crystal at the center.

Unlock the Hydro Totem Switch and Activate It

To disable the lava crystal, players must activate the totem switch and flood the cave. To do this, players must put three Hydro Cores on altars beside three Abyss Mage campfires. Hydro Cores are fully-charged Miraculous Hydrograna.

Once the Hydro Totem is unlocked and activated, it will flood the entire cavern, and cool-down the lava crystal that makes the lake boil!

How to Unlock and Activate the Hydro Totem

	Objectives
1	As soon as you enter the cavern, head forward until you see an empty campfire to your right. Then, go past it until you see a Hydro Stone to your left, which you need to hit to reveal the Mysterious Hydrogranum inside. Pick up the Hydrogranum and charge it until it becomes a Hydro Core.
3	Once fully-charged, head towards the nearest campfire and install the core into the mechanism. You'll know it's successfully installed when there's a Hydro around it.
4	Then, go back to the Hydrogranum and it pick it up once again, and place a Hydro Core into the mechanism on the campfire near the cavern's entrance.
5	The last camp is located just past the locked Hydro Totem, which is guarded by a Pyro Abyss Mage and some Pyro Slimes.
6	After defeating the mobs, hit the nearby Hydro Barrels to free the Hydrograna inside them. Picking up the three automatically charges them up to a Hydro Core. Install that core in the nearest campfire to unlock the Hydro Totem!

Use the Hydro Tunnel And Go Towards Iron Viscount

A hydro portal will spawn on top of the totem then ride it towards the Iron Viscount. Don't forget to claim the chest that spawned in front of it.

Ride the Fontaine Current Behind Iron Viscount

Ignore the Iron Viscount and just swim to the Fontaine Current in the cave behind it to push through with this quest.

You may also opt to fight this Local Legend of Fontaine! In case you want to do so, check out our guide on how to defeat Iron Viscount here:
How to Defeat the Iron Viscount

Get Ashore and Use the Hydro Tunnel

Get ashore once you reach the end of the current. Ride the Hydro portal found in the room to the right to go to the surface

Hydroculus Location

Do not forget to get the Hydroculus found behind the vines!

Arrive in the Surface and Dive for Loot in the Spring

The Hydro Portal will launch you towards the surface and you'll get the 'Core Cooling' achievement. The boiling spring will be cooled down as well, so you are now free to dive in for all the loot underwater.

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
Nostoi Region	Sea of Bygone Eras

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

Fontaine Item Guides

Fontaine Local Specialties
Rainbow Rose	Lumidouce Bell	Romaritime Flower	Beryl Conch
Subdetection Unit	Lumitoile	Lakelight Lily	Spring of the First Dewdrop
Other Items Found in Fontaine
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	Ridiculously Common Branch	Restored Score

Fontaine Domain Guides

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

All Fontaine Domains and Locations

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	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
Belleau Region World Quests
Still Mouthwatering!	Truly Mouthwatering!
Beryl Region World Quests
Book of Esoteric Revelations	Echoes of the Ancient World
Fishing Game	Good Stuff, but Terrible Taste
The Lone Phantom Sail	The Three Primary Colors of the Solar Corona
Were It So Easy	Strange Stone Chronicle
This Isn’t Pumpkin Soup…	Pursuit
Through the Looking Glass
Court of Fontaine Region World Quests
Another Horizon of Adventure	A Certain Notice
A Certain Trifle	A Certain Stamp
A Fontanian Message	Ann's Story: Prologue
Aqueous Tidemarks	Danger Lurks Everywhere in Fontaine
In Expert Company Part 1	In Expert Company Part 2
Self-Automatic Foraging	Seymour's Story: Prologue
Steambird Interview	The Final Question
The Fountain Flows Again	Unfinished Story
Upon a Flowery Field of Grass	Initial Facts
Happy Birthday	Where His Life Lies
Daydreams Beyond Space and Time

Fontaine World Quests

4.6 Fontaine Puzzles and Features

4.6 Fontaine Features
Washer Octopus	Lost Grimoires and Mysterious Bookshelves
Wonderchime Flowers and Allochromatic Anemones	Summon Currents with Scylla
Music Score Locations	Auric Anglerfish
Break the Chains that Bind Scylla	Portus Anticus Luxurious Chest
The Flying Outlander Achievement Guide	Juliano's Hidden Chests
How to Pet Osse	How to Take the Blank Score
How to Return the Flying Bird Phantasms	How to Rebuild the Golden Aqueducts

4.2 Fontaine Puzzles and Features

4.2 Fontaine Features
Humongous Hat Jellyfish	Potential Energy Orbs
Operable Mechanisms	Reveal the Altar's Secrets
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
How to Operate Dangerous Autocannons	Harmonious Reed Pipes
Floating Crystal Flowers and Platforms

4.1 Fontaine Puzzles and Features

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
Retrieve the Anchor at the Institute Dormitories	Retrieve the Anchor at the Institute of Clockwork Applications
Remains of the Day Secret Achievement and Chest	Water Barrier Seelie
Rag and Bone Shop

4.0 Fontaine Puzzles and Features

4.0 Fontaine Features
Fontaine Aquabus Guide	Court of Fontaine Waypoints Unlock Guide
Heart Plant Co-Op Hidden Chest	Sonar Resonance Points
Underwater Currents	High-Pressure Water Vents
Recovery Orb	Fontaine Echoing Conch
Fantastical Floating Ball	Pneumosia Blocks
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
Break the Bubble Formations

Fontaine Enemies

Fontaine Boss Guides
Emperor of Fire and Iron	Icewind Suite	Millennial Pearl Seahorse
Experimental Field Generator	Hydro Tulpa	Legatus Golem
All-Devouring Narwhal	The Knave
Fontaine Enemy Guides
Fontemer Aberrants	Tainted Hydro Phantasm	Breacher Primus
Clockwork Meka	Fatui Operatives	Praetorian Golem
Local Legends Guides
Iron Viscount	Fairy Knight Twins	Ocean Circuit Judge
Vivianne of the Lake	Fading Veteran	Swords of the Gorge
Ninianne of the Lake	Dobharcu, Lord of the Hidden	Automated Supercomputing Field Generator
Luachra the Brilliant	Yseut	Liam
Rocky Avildsen	Mageblade Corrouge	Chassanion
Deianeira of Snezhevna	Cineas

All Interactive Map Guides

All Interactive Map Guides