To find this element you will have to look for the pyramid-shaped structure in the Carouses Dune, which is where the Dendroculus is. Inside the structure where you will find a wind current, but the Dendroculus will be blocked by a barrier.
There is a room to the right with a blue triangle, so you will have to complete a puzzle. Pick up the blue item and use the wind current to slide down > turn left to find the spinning mechanism and turn the blue light beam to the blue pad. At this point you will be able to summon the next mechanism and for this you will have to touch the new cell, which will disappear into the wall.
This will give you access to a chest that you can unlock and a mechanism that you can activate.
This is everything you need to know about how to get the Dune of Carouses Dendroculus in Genshin Impact, so we hope that you are more than ready to complete this entire process to have the dune in your hands.