Cataclysm’s Quickening is Chapter 4 Act 4 of Genshin Impact.
Your objective is to find out the secret behind the Forbidden Zone, among other things.
Here’s a walkthrough and guide of Cataclysm’s Quickening in Genshin Impact.
This walkthrough is divided into various sub-quests.
Into the Deepwater Murk
The first quest is Into the Deepwater Murk.
You will need to investigate freely at the three locations marked on the map. One is the cafeteria.
The other is a group of guys, i.e. Cuistot and Lavarune.
The third one is Bavilliers who will talk about the TCG.
Once you’re done, head to the Production Zone: Upper Level to find Lyney.
You’ll see Lyney. Go towards him.
After talking to Lyney, the Traveler and Paimon will try to infiltrate the infirmary as the Traveler pretends to get sick.
After you’re done, return to the dormitories.
The quest completes here.
The Truth Shrouded in Shadow
The next sub-quest is The Truth Shrouded in Shadow.
Head to the production zone again to search for Lyney.
Then, head to the infirmary in secret as Lynette is supposed to be there but she has disappeared.
Search for clues in the infirmary.
You’ll find a letter implying that the Duke took Lynette.
You’ll then learn that Sigewinne knew about the Traveler and Paimon who were eavesdropping earlier.
As Lyney goes to the Duke’s office, chase after him and enter the office.
The Duke will then asks three things. The first one is on the 3-days continuous working hidden rule. You just need to pick the Sigewinne evidence.
For the hidden rule in the Pankration Ring, choose the Fonta evidence.
As for the third question, the Traveler won’t know the answer. Lyney tries to attack the Duke Wriothesley but fails as Sigewinne shoots him with a tranquilizer.
Then, Clorinde shows up as she rescued Freminet who went diving.
After the cutscene, you’ll need to understand the situation of the people around you. Talk to Lyney and later go to Wriothesley and Clorinde.
After assessing the situation, go back to the infirmary with Freminet.
As Freminet tells the story on how he almost died, you’ll be able to play as him for a short period. You’ll need to look for clues on Childe.
Jump down to the bottom.
You’ll see some devices. Start the device to lower the bridge.
Head to the other side and use the next device to turn the bridge and proceed upwards.
At the upper level, you’ll see two more devices. The left one adjusts the level and the right one adjusts the bridge rotation.
You need to go to the right-side device to rotate the bridge first. When you’ve gotten the correct rotation, go to the left-side device to bring the bridge up to your level and you can proceed.
In the next area, jump down again.
You’ll then need to dive into the water and swim all the way.
After getting injured from the Primordial Seawater, you’ll need to return to shore quickly. Freminet then loses consciousness as Clorinde saves him.
The quest ends here.
Secret Keepers and Forbidden Zones
The next sub-quest is Secret Keepers and Forbidden Zones.
Head to the Duke’s office to begin.
You’ll see him with Clorinde. Talk to the Duke about the secrets.
Then, follow the Duke (Wriothesley) down as he reveals a secret pathway.
Keep exploring ahead.
You’ll then learn that the Primordial Seawater has always been beneath the Fortress of Meropide. There’s a gate that prevents it from leaking but the amount of Primordial Seawater has been increasing rapidly.
Follow Wriothesley as he shows you his secret plan, i.e. to build a ship and escape in the future.
The quest ends here after learning the secret.
The next sub-quest is Calamitous Tread.
Go back to the infirmary to explain the whole thing to Lyney and the rest.
Next, go to the cafeteria.
Then, head back to the dormitories to rest.
After waking up, you’ll hear people running and yelling. Check on the situation outside.
Go to the Duke’s office to find out what’s going on.
Head downstairs into the Forbidden Zone using the elevator.
The gate gets pushed out by the Primodial Seawater and Wriothesley freezes it with his ice attack.
As the water is too strong, the Traveler, Paimon, Clorinde and Wriothesley all escapes and uses a few more gates to stop the water. Wriothesley then freezes the last gate.
You’ll then need to leave and inform Neuvillette about it but he already knows.
Go to the opera house to accompany Furina on her meeting with The Knave.
In the meantime, Neuvillette uses his ability to push the water back and create a new seal to stop the Primordial Seawater from coming out.
After the meeting with The Knave, follow her out to the exit.
The Knave will then explain further on what she actually thinks about Neuvillette and Furina and that Furina is probably not the real archon.
You’ll meet Neuvillette outside and learn that he is actually the Dragon Sovereign of Water for Fontaine.
The sub-quest ends here.
A Moment’s Respite
The last sub-quest is A Moment’s Respite.
Return to the prison to learn more about everyone’s situation, including Sigewinne, Cuistot, Lourvine and Lyney.
Then, talk to Wriothesley in his office.
Return to the dorms to rest.
The quest ends here. Chapter 4 Act 4 of Genshin also ends here.