A Two-Round Living Greyhawk Regional Adventure set in Ket
From the introduction:
The nightmares begin and do not cease – a doorway is opened, or is it being closed? What was set in motion countless centuries earlier is now about to be settled.
The final adventure in the Natural Evolution Series... one way or the other.
A two-round adventure with an Extended Play Option set in Ket for character levels 1 to 15.