Instructions
Return to the Zanarkand Temple and proceed north to the first puzzle room. Here, you must locate and step on the three spaces that form white squares when lit. The first space is in the far left column, fourth row from the bottom. The second space is in the fourth column from the left, in the sixth row up. The third space is in the second column from the right, second row from the top. After you light all three squares, head through the north door to the second puzzle room.
Enter the second puzzle room. Here, there are four spaces that will form white squares when lit. The first space is in the seventh column from the left, fifth row from the top. The second space is in the second column from the right, fourth row from the top. The third space is in the fourth column from the left, ninth row from the bottom. The fourth space is in the second column from the right, ninth row from the bottom. Once all seven white squares are lit, a hidden door opens in the first puzzle room to reveal the destruction sphere.
Return to the first puzzle room and grab the destruction sphere from the pedestal behind the newly opened door. You can now take the sphere back to the second puzzle room. Place it to the right of the screen and a treasure chest will appear. Open it to claim Yuna's Magistral Rod as your reward.