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This spell ensures privacy. Anyone looking into the area from outside sees only a dark, foggy mass. Darkvision cannot penetrate it. No sounds, no matter how loud, can escape the area, so nobody can eavesdrop from outside. Those inside can see out normally.
Divination (scrying) Spells cannot perceive anything within the area, and those within are immune to Detect Thoughts. The ward prevents speech between those inside and those outside (because it blocks sound), but it does not prevent other communication, such as a Sending or Message spell, or telepathic communication, such as that between a Wizard and his familiar.
The spell does not prevent creatures or objects from moving into and out of the area.
Mage's private sanctum can be made permanent with a Permanency spell.