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Small spoiler
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Well - there is an area called "Stone Sanctum" and one called "Inner Stone Sanctum".
The Stone Sanctum is the area before the Inner Sanctum, with the larged locked doors and where you meet the "Aribeth wannabe", you should be able to rest there.
But - the latter is the area where you fight Morag (Inner Sanctum), and you can't rest in that area.