midnight
Across the opening a sheet of crystal clicked into place . The Caverns were sealed . The haze was now inky black outside and billows of it beat against the protecting barrier . It might have been midnight of the blackest , starless night . `` So will it be for forty days . What is without -- dies , '' said Urg . `` Then we have forty days in which to prepare , '' Garin spoke his thought aloud .