Any one who got close recently couldn't help but notice the sign in the Tinnerai cavern that was positioned at the land bridge just before the Tinnerai complex itself has become larger and more prominent. Two demonic looking guards stand on the far side of the land bridge opposite the sign eager to enforce it.

"Tinnerai is not currently accepting visitors. Only those escorded in person by a Tinnerai are permitted beyond this point. Any who disregard this warning will be considered a threat and their corpse will be questioned at our conveniance. This is the only warning you will receive.
By order Ilharess Oloth'chu Tinnerai"

Thoughtfully the message is available in Drow, undercommon and common.

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Ilharess Oloth'chu Tinnerai
Faeryl Freth