User Comment: Living Greyhawk core series dealing with the Isles of Woe, and an invasion of the Duchy of Tenh by a alien force from the Ethereal Plane.
CORS2-02 Isles of Woe
CORS3-02 Dust of the Dead World
COR2-11 Escape from Tenh
COR2-13 Into the Dying Lands
COR3-02 Return to the Isles
COR3-10 Sepulcher of the Wizard King