HOW TO FIND SHEH RATA SHRINE
Sheh Rata Shrine is located in the Lanayru Tower, near the Wetland Stable.
How to solve the SHEH RATA shrine
Turn right where you start, jump onto the side of the platform and open the treasure chest.
Go back to where you entered, and rotate the sprocket. This will move the platform with the laser, as the laser transmits the sensor and lifts the water.
Swim straight ahead of where you started, and enter the room (now that the water has risen).
Use the magnet to pick up the barrel and place it in the water, directly above the key under the water. (Push the barrel under the water while you hold it with the magnet to find the exact position, then let it float to the surface when it is in place.)
Use cryonis to create an ice block roughly halfway between the door outside the room with the barrel and the platform using a laser.
Ascending to the top of the ice block.
Aim a bow and arrow at the key that the laser stumbled upon.
While the arrow was still in the air, he jumped from the block of ice and parachuted into the room with the key. The water level will drop, the barrel will throw the key, and you will be able to reach the end of the shrine.
Go meet Sheh Rata and collect a spiritual orb.