Pit of Doom

From A Wheel of Time Wiki

The area where the Bore in the Dark One's prison is most easy to detect, as well as being the area when he has the most control. This area lies under a mountain in the heart of Shayol Ghul.

This is also the only place where one can communicate with the Dark One. Although doing so makes one feel pain and ecstasy beyond imagining; it is somewhat like the feeling of the True Power. The Dark One has no physical manifestation that he uses, he simply speaks to you, although it may be inside the channelers head only.

Reality is twisted and malleable within the Pit of Doom, most likely due to the Dark One's direct influence. Likely due to this twisting of reality, a mindtrap cannot be established anywhere else in the world.

Channeling in the Pit of Doom can be sensed by the Dark One. Channeling in the Pit without permission is a sure way to anger the Dark One. Death is invariably swift.