In the time of the lastborn the abandoned world above the cities of man passed through its cycles for ages burying the old world deep in rapid growing vegetation, long after the last of the lastborn breathed their last their silent cities sit in darkness far below the world.
Above the depths of darkness there hide rents and sinkholes in the surface wind their way below the tortured earth were soon looming out of the eternal night great columned halls stretch into the depths, caryatids in petrified rows prehistoric forms of trees their branches like flying buttress bearing a mighty vaulted ceiling.
These mighty halls are a sure fired marker that a body is near the Silent Cities of the Lastborn.