You can only access this location by starting The Dirge of Bilqis questline. The Ruin Golem will move from its first location to Wounded Shin Valley and create a hole there. Inside it, there will be a Luxurious Chest behind Dendro totem puzzles (No achievement). It’s extremely easy but I’m doing a guide for it anyway~
Dendro Monuments Puzzle for Luxurious Chest
Teleport to the underground waypoint in Wounded Shin Valley and enter the ruin by using the Four-Leaf Clover. Keep following the path until you reach a room with the bright yellow mechanism you use during The Dirge of Bilqis quest.
From the bright yellow mechanism in the middle arena, you will find two Primal Embers next to the stairs. Follow those two embers to their torches to unlock the respective Dendro monuments. There are some spawned enemies but I believe that won’t be a problem for you.
Now all Dendro monuments are unlocked. You can either use a Dendro character to activate all 5 totems or summon Dendrograna from the Auspicious Branches near the Luxurious Chest.
And done! Well that was short and easy ehe~