Trail of Subjugated Saurians

Trail of Subjugated Saurians (unofficial name) is a Hidden Exploration Objective that takes place in Coatepec Mountain, Natlan. Discover the Phlogiston Extraction Research Center and deactivate it by following the trail of Fatui and their Saurian prisoners.

Steps

1. Enter the Phlogiston Extraction Research Center, located underground, accessed from a crevice guarded by Fatui Skirmishers northeast of Ancestral Temple, Coatepec Mountain. The closest teleport would be Domain of Mastery "Blazing Ruins".
2. Defeat the Fatui at the base, i.e. at the entrance of map level Extraction Research Center: Experimental Site
   • Fatui Skirmisher - Pyroslinger Bracer ×1
   • Fatui Skirmisher - Cryogunner Legionnaire ×1
3. Open the Common Chest to obtain Key With Frontal Notches ×1
4. Use the key to unlock the nearby Saurian Cart
   • This will create Yumkasaurus Spiritsconces along the path to the locked gate
5. Use the Replica "Relay Ball" to unlock the gate
6. Proceed into the control room and enter the eastern room
7. Catch the burrowing Tepetlisaur Whelp
   • A Removable Grappling Hook and a Tepetlisaurus Spiritsconce will appear
8. Remove the grappling hook and attach it to the metal crate
9. Grab and pull the metal crate twice to bring it to the room's entrance
10. Remove the Replica "Relay Ball" and return to the control room
11. Insert the Replica "Relay Ball" into one of the metal platforms
    • The southern room's gate will open and the following enemies will appear:
      • Fatui Skirmisher - Anemoboxer Vanguard ×2
12. Enter the southern room and grab the second Replica "Relay Ball" from inside the hanging cage above, with the help of the Special Coilgrass Sigil
13. Return to the control room and place the second Replica "Relay Ball" into the other metal platform
14. Disable the machine (requires pressing "Disable" twice)
15. Hold out against the Fatui for 60 seconds
    • The first two enemies will appear from the following list, and with each enemy defeated, subsequent enemies will keep replacing them in the given order, cycling until the timer runs out
      • Fatui Skirmisher - Anemoboxer Vanguard ×1
      • Fatui Skirmisher - Pyroslinger Bracer ×1
      • Fatui Skirmisher - Electrohammer Vanguard ×1
      • Fatui Skirmisher - Geochanter Bracer ×1
      • Fatui Skirmisher - Cryogunner Legionnaire ×1
16. Defeat the Veteran Fatui Pyro Agent
    • An ally Yumkasaurus and Tepetlisaurus will fight alongside the player until the Veteran Fatui Pyro Agent is defeated

Gameplay Notes

• Completing step 15 (holding out against the Fatui for 60 seconds) grants the Wonders of the World achievement Righteous Resistance.
• Completing the quest (defeating the Veteran Fatui Pyro Agent) grants a Luxurious Chest containing Key With Rear Notches ×1 and Shattered Night Jade ×1.
• After defeating the Veteran Fatui Pyro Agent, the Saurians will be freed and can no longer be interacted with.
• The following chests are unlocked in the process of this Hidden Exploration Objective, but are not needed to unlock its related Achievement or the final Luxurious Chest:
  • Unlocking the second Saurian Cart in the control room using the Key With Centered Notches reveals a Precious Chest.
  • Riding the newly unlocked Spiritway in the southern room grants an Exquisite Chest after reaching the end.

Dialogue

Interactables

The following interactables can be found in the Phlogiston Extraction Research Center. Unlike the Saurians, they will remain after completing the Hidden Exploration Objective.

Research Center Emergency Machine Operation Handbook

Diary of a Soldier Abroad

Inspection and Maintenance Records

Tutorials

Trivia

• Nomokonov, Sidorenko, and Vasily — who are named in the above interactables — comprise the Natlan Local Legend Polychrome Tri-Stars. However, they are found at Huitztli Hill, much farther west than the Phlogiston Extraction Research Center.
• Diary of a Soldier Abroad is hinted to belong to Sidorenko, as in the diary, he tells himself to not get locked inside, and in Regarding the Emergency Brake System, he mentions accidentally locking himself in a cage.

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