I have not done this yet, so I can not be exact (doing it when I leave here though!) but from what I have read in other threads, when you use the glowstones to open the doors in the Sunken City that open to small rooms with lil pools under levers on the back walls...you have to have BOTH doors open & staying open & then when you turn the levers, an alcove will open in the bigger room that the halls to those rooms are connected to.
The third tablet will be in the alcove or in a chest in the alcove...not sure on that but that's where it will be...the alcove that opens. : )
Not sure if one has to be done before the other (i.e. right lever & left lever) so be sure to save your game prior to trying! I know I will be!
Good Luck!
: )
Moni
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