In
the shadow of the valley of Death, there is a door of stone hidden
from the knowledge of all but the guardians of our worlds. This door
is older than any race, perhaps
even older than the worlds, and
it has always been shut.
It
is forbidden to search for the door. It is forbidden to look upon the
door.
But
it is most forbidden to open it. For while one is searching and
looking upon it, it is always possible to go back. But once you open
it, it is too late.
There
is no turning back once the door is opened.