This guide shows how to complete the objective “Look for the final Bedrock key” in the world quest “Surreptitious Seven-Star Seal Sundering” of Genshin impact 2.6. You need to complete this quest to remove the Chasm Seal Barrier that let you enter The Chasm: Underground Mines in Genshin Impact 2.6
Look for the final Bedrock key
A Player will get the objective after they have destroyed all three remaining Bedrock Keys. Zhiqiong (NPC) will as ask you to break the final Bedrock key to break the barrier.
The final Bedrock key is located inside a cave in the Cinnabar Cliff area. The location is marked on the map below, from the nearest teleport waypoint north and then drop down the cliff. Glide down to the location and enter the cave with a rail track.
At the end of the cave, you will find the last Bedrock key and two cage-shaped floating objects.
First, break the yellow crystal rock to collect the Geogranum. It is recommended to use a claymore character to break rocks crystal fast. Place Geogranum on the cage-shaped floating objects and then hit it to shoot a beam on Bedrock Keys.
After that, drop down inside the cave and do the same process with other cage-shaped floating objects to shoot a beam on Bedrock Keys.
Quest will end, once you successfully hit the Bedrock Keys with a beam coming out of the cage-shaped floating objects.