In Genshin Impact, the only way to get access to the treasures hidden inside The Beryl Boiling Lake can be done by first cooling it down, a feat that will demand a little bit of time and which will reward you with a secret achievement.
But how exactly can you cool down the lake and unlock all of the rewards that come with it? Here’s how to cool down the Beryl Region Hot Lake and get the secret Core Cooling achievement in Genshin Impact.
How to Cool Down The Beryl Boiling Lake in Genshin Impact
After completing the lake’s puzzle, you will be able to cool down the Beryl Boiling Lake and get the Core Cooling Achievement in Genshin Impact by first interacting with the Hydro particle at the center of the lake. Once you interact with it, the particle will transport you to a cave located below it.
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Once at the cave, you will need to unlock the Hydro totem at the center of the area. To do that, you must find and then activate 3 mechanisms like the one below.
You will be able to activate each of them by making use of a Hydro Core generated by collecting 3 Hydrogana. All mechanisms will be located by a set of on-fire ritual stakes, situated within the areas highlighted in the map below.
You will be able to get all the Hydrogana needed to get the Hydro Cores and activate the mechanisms by heading to the spot marked in blue above and then destroying the three Hydro seals there. Each seal will hold one Hydrogana.
After generating a Hydro Core with the Hydrogana, just activate any device and then head back to the area and get another 3. Repeat the process until all 3 mechanisms are active.
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Once all mechanisms are active and the Hydro totem at the center of the cave is unlocked, apply Hydro to it to fill the cave with water and then head to the current highlighted in the image below.
There’s no need to defeat the Iron Viscount boss guarding our goal; Those who wish to do so can check out how to defeat the boss and unlock the Iron Viscount Achievement at the end of this guide.
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After following the current to a new area —a feat that will unlock the Twenty Thousand Leagues Under the Sea Achievement— you will be able to head back to the lake and unlock the Core Cooling Achievement by heading right and then interacting with the Hydro particle there.
The now-cooled lake will feature two chests, one Precious and one Exquisite, as well as a wide array of Condessense Crystals, which you can use to get the Fontaine Craftable Weapon Diagrams.
How to Defeat the Iron Viscount Boss and Get the Achievement
Like the Ocean Circuit Judge Boss, you will be able to defeat the Iron Viscount Boss in Genshin Impact by first interacting with an Xenochromatic Armored Crab and acquiring its shielding ability. After doing so, wait for the boss to begin his signature throw attack, and then hold your Elemental Skill key/button while aiming at him.
Once the boss makes his throw, wait for the projectile to reach your shield, and then let go of your Elemental Skill key at the moment it hits. Doing so will cause your shield to absorb the attack and then send it back for maximum damage.
After performing the counter for the first time, just focus on staying mobile and on repeating the strategy every time the boss performs his throw in order to quickly defeat him.
This guide was made while playing Genshin Impact on PC and PS5.
