This page explains how to find the Toh Yahsa shrine and solve the "Buried Secrets" puzzle.
How to Find the Shrine
This shrine is northwest of Ridgeland Tower, in Thundra Plateau.
When you arrive in Thundra Plateau, the shrine monk will speak to you. You have to put the glowing orbs into the correct places on the plateau. However, with the constant rain, it is difficult to climb.
The south side of the plateau has a partially collapsed wall with no brickwork on it. This part of the wall is short enough that you can jump up it and reach the top of the plateau without sliding down from the rain.
On top of the plateau, you find the purple orb. Put it into the purple target hole nearby.
The green target hole is across from the purple one, and on top of the green target's pillar, you can see the green orb. Look for the Rusty Claymore on top of the plateau, and use Magnesis on it. Stand on the flat stone behind the green target's pillar, and use Magnesis to put the Rusty Claymore on top of the green statue, between you and the green orb. Try to center the claymore behind the orb. When lightning strikes the claymore, the green orb will shoot away from it, down onto the plateau. Go pick it up and put it into the green target hole.
The red orb is on top of a statue east of the plateau. Use Magnesis to put the claymore behind the red orb so that the orb will be shot toward the plateau when lightning strikes. If the red orb does not reach the plateau, put it on the stone tiles on the hill northeast of the plateau, then put the claymore behind it. You may need to experiment with different positioning of the orb and the claymore. The orb will be shot away from the center of the claymore. If you are not sure where the center is, watch the claymore when it is about to be struck by lightning. The flashes of electricity come from the center of the claymore.
If the claymore disappears, there will be another one on top of the plateau. You can climb up to the plateau by climbing up the collapsed rock wall on the south side of the plateau.
The yellow orb is on top of a dragon statue north of the plateau. Put the claymore near the base of the dragon statue, then climb up the south side of the dragon, since the dragon's head shields it from rain. While standing on the first segment of the dragon, use Magnesis to set the claymore behind the orb so it will shoot in the direction of the plateau when lightning strikes.
If the yellow orb does not reach the plateau, put it on the stone tiles on the hill northeast of the plateau, then center the claymore behind it.
How to Solve the Shrine
Go down to the lower level and bomb the cracked stones near the elevator. There is a hidden passage under the platform with the elevator that has a chest inside. The chest contains the Rubber Armor.
Near the hidden passage, there is also a large metal block. Use Magnesis on it to push the treasure chest off of the tall pillar near a corner of the room. The chest contains an opal.
Then blow up the cracked blocks under Toh Yahsa. There is a large switch on the floor under the blocks. If you got rid of all the cracked blocks already, use Magnesis to put the large metal block between the short platform and the ledge with the lower ladder on it, and go to the lower ladder. Climb up it, then use Magnesis to put the large metal block onto the switch. This will open the bars. Climb up the ladder and talk to Toh Yahsa to get the Spirit Orb.