Here's how you can find the Cup of Commons in Genshin Impact and the Chasm, which is by clearing the Undetected Infiltration quest.

The Cup of Commons is one of the six offerings items you'll need to complete the Millennial Mountains world quest in the Chasm. However, while all the other offerings can easily be obtained, this one is locked behind its own world quest, Undetected Infiltration. So we have a dedicated guide to help you out.

How to clear the Undetected Infiltration world quest

Normally, you should have ended up triggering this quest when going through Surreptitious Seven-Star Seal Sundering, but if you haven't, then go to the location on the map screenshot below and beat the Treasure Hoarders there. A cutscene will trigger to explain how they are actually Millelith. Their leader will give you a new objective on your map.

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Undetected Infiltration world quest start location

Meet up with Yanbo in front of the smuggler's camp

Speaking with Yanbo, you will be asked to attack Treasures Hoarders camps. You'll be able to pick one of three camps to be dealt with automatically, just pick whichever and you will need to clear the other two. The two camps will automatically appear on your map so just go there and defeat the mobs.

You will then need to clear a fourth, bigger camp. It will automatically display on your map and radar like the previous ones. This will be a pretty easy fight though a bit long, so switch to your best party members. You will most notably have to fight Brass Bull Zhao, the "Big Sister" of the Treasure Hoarders we've already heard about and fought with before, and the "Big Brother" Chen the Flower. They respectively have fun boss titles: "How Is a Wild Bossy Not A Heroine?" and "A Flower Can Still be a Real Man".

How to get the Cup of Commons in Genshin Impact

Once you have defeated all the Fatui and Treasures Hoarders, the Undetected Infiltration world quest will be cleared and a treasure chest will appear. You will find the Cup of Commons inside, and you will now be able to clear the Millennial Mountains quest.

Genshin Impact 2.6 is currently available on PC, PS4, PS5, iOS, and Android. Make sure to check out our other guides for The Chasm.