In the Depths, an Unexpected Reunion

Talk to Katheryne: Begin the quest by speaking with Katheryne at the Adventurer's Guild in Liyue Harbor. She will mention a commission related to The Chasm and a miner named Yuehui.

Look for Yuehui at The Chasm: Travel to The Chasm in southwest Liyue. Activate the waypoint near the entrance and locate Yuehui, who is standing by a crane. He will explain that miners have noticed Hilichurls walking into the depths in a daze, leading you to believe the Abyss Order might be involved.

Enter The Chasm: Underground Mines: After completing the World Quest 'Surreptitious Seven-Star Seal Sundering', you can access the underground mines. To proceed with this quest, you must first complete the 'Chasm Spelunkers' World Quest, which involves finding three diary fragments.

Diary Fragment 1: From the waypoint, follow the wooden platform west to a bridge. Cross it, head southeast, and find the fragment on a wooden crate near purple goo.

Diary Fragment 2: From the waypoint, drop southwest near the crane elevator to a wooden structure. The fragment is on an ore crate.

Diary Fragment 3: On the bottom floor, southeast from the waypoint, find a broken crate next to a white tent with a lumenlamp. This area may be guarded by Treasure Hoarders.

Go to the designated location: After finding the diary fragments and reporting to Jinwu (as part of 'Chasm Spelunkers'), you will need to clear a blocked tunnel. This requires a cannon and two 'Storehouse Security Keys'.

Obtain Storehouse Security Keys: These keys are obtained by completing another World Quest.

Key 1: From the waypoint, glide north to the bottom floor with purple goo. Cleanse the goo and find the key in a vase on a distillery.

Key 2: From the first key's location, drop down and glide northeast. Go past the purple goo and follow a dilapidated bridge northeast. You'll find treasure hoarders near a purple crystal where the second key is located.

Investigate the tunnel: With the keys, access the gate north of the blocked tunnel. Use the cannon to clear the tunnel.

Enter the inverted city: After clearing the tunnel, drop into the hole. You will enter an inverted city and encounter Dainsleif.