Assault on Nightwyrm Fortress (P3), softback adventure for D&D 4th edition, by Bruce R. Cordell and Robert J. Schwalb
“Local hero Jothan Ironspell has fallen in battle, and all attempts to raise him from the dead have failed. And he is not alone. Someone or something is stealing and devouring the spirits of the dead, in defiance of the Raven Queen. All signs point to the Shadowfell and an ancient fortress with a monstrous secret.
This adventure takes characters from 17th level to 20th level. It can be played as a standalone adventure or as the conclusion of a three-part series that begins with P1 King of the Trollhaunt Warrens and continues with P2 Demon Queen's Enclave. This folder contains two adventure books and a double-sided battle map designed for use with D&D miniatures.”