Discover the secrets simmering beneath the boiling waters of Fontaine’s Beryl Region in Genshin Impact. This intriguing puzzle challenges you to manipulate three elusive Water Volume Detection Crystals, unlock a precious chest, and dive into an underwater lava cave filled with hidden treasures and a formidable mini-boss. Mastering this two-part puzzle not only cools the scalding lake but also opens a gateway to a brand-new area teeming with rewards and adventure.
Read on to find out how to open the precious chest in the middle of the lake and how to cool down the lake to reveal a submerged luxurious chest.
Boiling Lake puzzle location
The Boiling Lake puzzle in Genshin Impact is located in the Beryl Region of Fontaine, specifically on the island of Elynas, southwest of the Court of Fontaine and just south of the Statue of the Seven. The lake is surrounded by tree roots and marked by bubbling, steaming water that damages characters if they enter it directly. Nearby, there is a Teleport Waypoint on a cliff overlooking the lake, providing easy access to the area. To solve the puzzle, players must interact with three Hydro pillars (Water Volume Detection Crystals) around the lake, freeing and moving them to the center to unlock a chest and activate a Hydro portal leading to an underwater lava cave with further challenges and rewards.
The boiling lake can be found to the south of Elynas and to the east of West Slopes of Mont Automnequi. Walk south along the path from the Statue of the Seven to find a lake that damages you if you touch it.
How to open the chest in the middle of the boiling lake
To open the chest in the middle of the boiling lake in Genshin Impact’s Beryl Region, you need to solve a puzzle involving three Water Volume Detection Crystals scattered around the lake. First, locate and free each crystal: one is guarded by crabs at the southwest, another is inside a Pneumousia Storage Box to the north, and the third is behind burnable roots at the southeast. After defeating enemies and burning the roots, move all three crystals to the center of the lake. Then, glide to the rock at the lake’s center, collect the Hydrograna to transform it into a Hydro Core, and stand among the three crystals to activate them simultaneously. This will unlock the Precious Chest. After opening it, a Hydro portal appears, leading to the next part of the puzzle and unlocking further rewards and areas.
To unlock the chest, you’ll need to find three water volume detection crystals around the lake and move them to the center.
1. Head over to the crabs by the lake, and defeat them to unlock the crystal.
2. Interact with the crystal to move it to the center of the lake.
3. Move towards the second location marked in the image above, and interact with the Ousia Block, the purple orb on top of the tree.
4. Hit the Pneuma Block, the golden pillar, to unlock the crystal, and interact with it to move it to the center of the lake.
5. Go around the lake to the third location, and set the thorns on fire to unlock the third crystal.
6. Interact with it to move the last crystal to the center of the lake.
7. Travel to the chest at the center of the lake by gliding or swimming, and grab the miraculous hydrograna, the orb of water, above the chest.
8. Step in the lake for a split second to afflict your character with hydro, causing the Hydrograna to create a circle of water around your character.
9. Stand in the center of the three water crystals to activate all three of them at the same time, unlocking the chest.
But wait, there’s more! Once you open the chest, a current will appear that will send you to a hidden cave with another puzzle.
How to cool down the roiling lake
To cool down the roiling boiling lake in Genshin Impact’s Beryl Region, you first need to locate and free three Water Volume Detection Crystals around the lake. One crystal is hidden behind thorny vines that must be burned using a Pyro character, another is unlocked by defeating Pyro crab enemies, and the third is revealed by interacting with a mechanism after moving a special Ousia block. After freeing them, move all three crystals to the center of the lake. Then, stand on the central rock to collect the Hydrograna, which transforms into a Hydro Core when dipped in the water. Activating all three crystals simultaneously with the Hydro Core will unlock a chest and open a Hydro portal leading to an underwater lava cave. There, extinguish three campfires by placing Hydro Cores on pedestals, which floods the cave and cools the lake. This completes the puzzle, allowing safe access to the lake and rewards including a Luxurious Chest and the Core Cooling achievement.
Inside of the hidden cave, you’ll find a hydro pillar, a Pyro Abyss Mage, and some Pyro Slimes.
1. Defeat all of the enemies before solving the puzzle.
2. Make your way to the hydro pillar and follow the blue trail to the north to find a pedestal for a Hydro Core and a lit campfire.
3. Turn around to find a Hydro stone, and break it to gain a hydrograna, which will turn into a Hydro Core as your character is affected by Hydro.
4. Leave the Hydro Core in the pedestal by the fire, and then follow the blue path that leads to the east to find another pedestal and campfire.
5. Look to the south to find a wooden box beside the wall.
6. Break the box to unleash a hydrograna, and step into the water for a split second to afflict your character with Hydro – turning the hydrograna into a Hydro Core.
7. Place the Hydro Core into the pedestal and follow the last path to the southwest to find three Hydro slimes hiding inside barrels.
8. Break the barrels and collect the three hydrograna, which will turn into a Hydro Core.
9. Place the Hydro Core into the pedestal and return to the unlocked Hydro Pillar.
10. Switch to a Hydro character and activate the Hydro Pillar, filling the cave with water.
11. Interact with the current above the Hydro Pillar, which will drop you off in front of a precious chest and Iron Viscount, a gigantic crab.
12. Open the chest and avoid the fight by swimming past Iron Viscount into the current behind it.
13. Swim along the current until you emerge from the water.
What secrets does the Boiling Lake puzzle hide in Fontaine’s underwater caves
The Boiling Lake puzzle in Fontaine conceals a series of intriguing secrets within its underwater caves. After solving the puzzle by collecting and positioning three Water Volume Detection Crystals around the lake to cool the boiling water, players unlock access to a hidden underwater chasm. Inside this cave, they encounter a Hydro pillar, a Pyro Abyss Mage, Pyro Slimes, and a formidable mini-boss known as the Iron Viscount, who can be fought or bypassed.
Completing the puzzle and exploring the cave rewards players with multiple treasures, including a precious chest in the lake’s center, a Hydroculus hidden behind vines, and a chest inside the lava cave itself. The puzzle also grants the “Core Cooling” achievement and transforms the scalding lake into a safe area to dive into for further loot.
In essence, the Boiling Lake puzzle leads to a multi-layered adventure combining combat, exploration, and valuable rewards hidden beneath Fontaine’s boiling waters.
What is the significance of the Hydro portal in Fontaine’s underwater caves
The Hydro portal in Fontaine’s underwater caves serves as a crucial gateway that transports players from the surface boiling lake to a hidden underwater chasm, unlocking a new area for exploration and puzzle-solving. After opening a treasure chest in the Boiling Lake, the Hydro portal activates, allowing players to enter the lava cave beneath the lake, where they must solve a secondary puzzle involving placing charged Hydro Cores on altars to flood the cave and cool down the lava crystal causing the lake to boil.
This flooding transforms the hazardous lava cave into a navigable underwater area, revealing additional treasures including a chest and a Hydroculus, and triggering the appearance of the Iron Viscount mini-boss encounter, which players can choose to fight or bypass. Ultimately, using the Hydro portal and completing the puzzle grants the “Core Cooling” achievement and cools the boiling lake, enabling safe diving and further exploration of Fontaine’s submerged secrets. Thus, the Hydro portal is significant as it links surface puzzle completion with underwater exploration, unlocking new content and rewards in Fontaine.
