Says He Who Seeks Stone is one of world quest in Chasm, Liyue. Require to finish Surreptitious Seven-Star Seal Sundering before it’s available.
Talk to Muning to start this quest and he will ask traveler to gather 3 Archaic Stone from Chasm.
Initially, he will ask for 3 Archaic Stones. But you can give him all 9 archaic stones for more rewards, 60 primogems in total.
There’s 9 Archaic Stones available in Chasm: 7 stones available in surface marked with red number, and 2 stones available inside a cave or underground marked with blue number.
#1 Archaic Stone
Teleport to waypoint in Chasm entrance then go to entrance. After that you can walk and climb through outher wall and reach that spot.
#2 Archaic Stone
You can walk and glide from first location or teleport waypoint in Lumberpick Valley.
#3 Archaic Stone
Walk and glide from previous location or statue of the seven in the area.
#4 Archaic Stone
You can reach this area by teleporting to statue of the seven then glide down to the area.
#5 Archaic Stone
Can be found at area near hilichurl camp. It’s closer to start from previous location than from closest teleport waypoint.
#6 Archaic Stone
From previous location, walk straight to east until you reach the location.
#7 Archaic Stone
Most likely it’s first Archaic Stone you get since this location also used for first Chasm main quest when you have to destroy Bedrock to unseal Underground Chasm gateway.
#8 Archaic Stone
Head to nearby teleport waypoint then enter the tunnel, passing spider web until you’ve reached this spot. If you can’t find the stone, find a spot where there’s hilichurl digging near Seelie.
This area also used for first Chasm main quest when you have to destroy Bedrock to unseal Underground Chasm gateway.
#9 Archaic Stone
Head to statue of the Seven then glide down to the area. This area was also used for first Chasm main quest when you have to destroy Bedrock to unseal Underground Chasm gateway.