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The Phlogiston Extraction Research Center in Genshin Impact is an experimental site of the Fatui where several Saurians are being held hostage. See how to use the Key With Rear Notches, how to get the luxurious chest, and all known info about it here!
List of Contents
The Phlogiston Research Center is an underground area in Natlan. To reach it, you can either teleport to the Waypoint found northeast from the Ancestral Temple or teleport to the Blazing Ruins Domain.
| # | Phlogiston Research Center Directions |
|---|---|
| 1 | 
Follow the road until you come across a fork in the road, one of the paths having a lot of Fatui Skirmishers. |
| 2 | 
You are on the right track if you end up going deeper, and encountering more Fatui Skirmishers and caged Saurians along the way. |
| 3 |
 At the end of the path is a giant opening in the ground that you can jump into. Glide down and defeat the Fatui Skirmishers at the bottom. |
| Phlogiston Research Center Puzzle Guide | |
|---|---|
| 2 |
 After defeating the Fatui Skirmishers, the Common Chest nearby will open and give you a Key with Frontal Notches. Use this key to open the nearby door, and free the Yumkasaurus inside it. |
| 3 |
 This will unlock a Spiritsconce that that can be used to indwell as the Yumkasaurus. Follow the path as one, as its abilities will come in handy. |
| 4 |
 At some point, you will have to cross a pipe that breaks before you step on it. This will drop a Replica Relay Ball that can be used to open the gate right next to it. |
| 5 |
 Go across the platform, until you reach an Electro Fatui Skirmisher. Defeat him, open the Exquisite Chest to get the Key, and claim the Precious Chest inside the cart. This Precious Chest has a chance of rewarding the player with a Green Obsidian Fragment. |
| # | Righteous Resistance Achievement Guide |
|---|---|
| 1 |  Follow the path where you can see a Cryo Fatui Skirmisher from afar; defeat all the Fatui inside on sight. |
| 2 |
 Once cleared, check the small patch of land to the right side of the Trapped Tepetlisaur, and catch the burrowing whelp. |
| 3 |
 Doing so unlocks a Tepetlisaur Spiritscone, which you can use to transform into to get the Grappling Hook. |
| 4 |
 Afterwards, indwell back into a Yumkasaurus and attach it to a nearby box. |
| 5 |
 Once attached, use the grappling skill of the Yumkasaurus to drag the box all the way to the edge. |
| 6 |
 This is crucial as claiming the Relay Ball will result in the gate closing; the box will stop it from closing half-way. |
| 7 |
 Bring the Relay Ball you got from closing the gate earlier, and place it onto the left port; this will open a gate in the cave, and Anemo Fatui Skirmishers will spawn. Defeat them, and go to where they came from. |
| 8 |
 The Relay Ball can be found in one of the hanging cells. Indwell into a Yumkasaurus, and use the grappling hook skill to go to one of the Dendro nodes. Afterwards, grab the Relay Ball once you are closer to it. |
| 9 |
 Go behind where you came from until a Relay Ball port can be found besides a gate. Place the Relay Ball there to open the gate, go outside, then grab the Relay Ball again. |
| 10 |
 Bring the Relay Ball to the second port on the main base platform, and place it on the unoccupied port. This will activate the main lever. Interact with it twice so that the Blue Line is facing down. |
| 11 |
 This is automatically spawn Fatui Skirmishers on the main base platform, and you have to hold out for one minute. They will keep spawning no matter how many you can defeat in a minute, so treat this as a survival mission. |
| 12 |
 Survive the one minute onslaught of Fatui Skirmishers, and the Righteous Resistance achievement is finally unlocked! |
Claiming the achievement does not mean the mission is over.
| # | Phlogiston Research Center Puzzle Guide |
|---|---|
| 1 |
 As soon as the onslaught ends, you have to help the freed Saurians against a Pyro Fatui Agent that has its Pyro clones already active. |
| 2 |
 Ignore the Pyro clones; the main focus is defeating the Pyro Fatui Agent. Doing so will give a chance for the Saurians to escape. |
| 3 |
 Afterwards, a Luxurious Chest will spawn. Opening it will reward the Traveler with a Shattered Night Jade and a Key with Rear Notches, on top of the usual prizes from opening a Luxurious Chest. The Shattered Night Jade is a crucial item needed to eventually make the Night Jade. |
| 4 |
 Go back to the area where you went after defeating the Anemo Fatui Skirmishers earlier, and use the Key with Rear Notches to open the final prison and free the Koholasaurus. |
| 5 |
 Freeing the Koholasaurus will spawn a Spiritsconce that will let you indwell into one. Transform, then follow the river path until a Spiritway can be seen. Ride on it to get out of the cave. |
| 6 |
 At the end of the Spiritway, an Exquisite Chest will spawn as you as you land. This marks the official end of this hidden storyline! |
Phlogiston Extraction Research Center Puzzle Guide
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