ALL 4 Sun-Stone piece of the puzzle – Location of pieces
1. Solve a candles puzzle on the left side of that room. In the center platform, you will find the 1st fragment.
2. 2nd fragment is placed in Taimurian Camp. You should solve a Totems\Statues puzzle, and after that, you will find a piece of stone here (where Zaar stands in the picture).
3. 3rd fragment could be found in Dura’Tyr in the room. Check the picture and a map there to find in which room exactly.
4. the Last piece of Sun-Stone is placed in Ziggurat of the Sun. Just change a mirror near the teleporter on that hole, and you will get it.