In Star Wars Jedi Fallen Order, you will visit Ilum. Your task will be to get the crystal that will serve you to repair the lightsaber.
There is a Jedi Temple on Ilum. You will have to solve a puzzle to be able to move on.
Start by moving one part of the mechanism. You can simply pull this object towards you or go around and push it towards the entrance to the temple.
Attach the rope to the installed mechanism. Remove it from the mechanism located to the right of the temple's entrance.
Your third task is to grab the line attached to the crystal and drag it so that the sunbeam is directed at the ice wall. After a few seconds the ice will melt - this unlocks the passage further.
The fourth task is to attach the line from the crystal to the mechanism and push it away so that it ends up on the other side of the temple.
Time for the last step. Grab the rope located to the right of the gate, and set so that the sunbeam can melt the next ice wall. After a few seconds, you will open another passage that will allow you to continue the mission.