Chambers of Reflection (Aten)
A two-treasure location in central Aten. One treasure is the chamber on the west side, in a white chest.
The other is in the library building at the north end, in a red chest. Looting both completes the mission.
This is also a relic statue location. Note that the relics can be shattered by arrows, even if they seem to have no effect at first.
The riddle treasure for Aten can also be found in the northern library here, accessible through a crack between bookcase and wall in the northeast corner.