Kay Noh Shrine
Power of Electricity
In the first room, pick up the Electric Orb and drop it on the charge point to open the door.
In the next room, head to the far right and kill the Guardian Scout I. Cut the rope with an Arrow to drop the orb, and carry it back to the charge point on the other side of the room. This will cause the nearby conveyor belt to operate, moving the large block out of the way. Run ahead and open the treasure chest to get a small key.
Use the small key on the locked door and defeat the Guardian Scout II that is up ahead.
In the final room, run up ahead and then immediately turn around. Look up above and you'll find a treasure chest. Use Magnesis to pull it down and open it to get a Moonlight Scimitar or a Gerudo Scimitar. Look to the pool on the right and use Magnesis and you'll see that electricity is not fully flowing. Use Magnesis to arrange the cubes so they are close enough, causing electricity to flow. This will open up the gate leading to the altar. Speak with Kay Noh to get a Spirit Orb.
Place the Electric Orb on the spot on the right to open the door. Shoot the rope with an Arrow to cut down the electric orb. Run over to the treasure chest and get a Small Key. Use Magnesis to pull down the chest from above.