The evil cats end up here when they die. Their souls are trapped in a place where they cannot hope to do anything but wander for the rest of eternity. Prey is always out of reach, water is always sour, and a cooling breeze never comes at the right time. The place you are trying to get to is suddenly not where you thought it was. The Blackstone is in the middle of this dark wasteland, and if a cat here could find it, they could see the living and communicate with them.