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The Foolish Fatuus is a World Quest in Sumeru for Genshin Impact. See how to unlock The Foolish Fatuus quest, walkthrough and rewards, and how to interrogate Kasim's and his willpower here!

You have to clear all 8 Strange Devices in the Eremite Camps in Sumeru to unlock The Foolish Fatuus. Afterwards, head to the camp nearest to Yasna Monument to start the quest.
Strange Energy Extraction Device Guide

Start the quest by approaching the Fatui and the Eremite on the camp in Yasna Monument. Afterwards, defeat Oleg, a Pyro Fatui Agent. Go to Camps 2 and 3 to defeat Oleg again, then follow the path to the last camp and defeat Kasim the Bandit.

Interrogate Kasim for the wherabouts of the Fatui Stronghold. You can choose to either believe or doubt Kasim. Both choices will lead to the same next step anyways, so feel free to diminish his willpower by doubting his words.

Investigate the note on top of the box behind the location where Kasim was standing. It will give you a clue to the location of the Fatui stronghold!

Head north of Pardis Dhyai, then change the time between 20:00 PM and 06:00 AM. Light up all four Pyro Torches afterwards.

Return to Yasna Monument and head to the Fatui Stronghold. There, you'll find Oleg behind bars. Talk to him and follow him inside the cave. Oleg will ambush you, so defeat all Fatui enemies once again. Report to Rukjh Shah afterwards to complete the quest.
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Open Sesame! |
| Use the Secret Code to enter the Fatui's hidden encampment. |
Completing the quest rewards you with the Open Sesame! Achievement, which gives you 5 Primogems.

This quest was released in the Version 3.0 Sumeru update which went live on August 24, 2022! Check out all new content in the newest update here:
Version 3.0 Release Date & Patch Notes

Quest seems to have been changed. Doing it in 4.6 and it no longer requires you to look for clues for the whereabouts of the stronghold.
The Foolish Fatuus World Quest Guide



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