Iron Tower Trilogy

From Author Wars - https://authorwars.com/publications/iron-tower-trilogy-86366.html

Overview:

Title: Iron Tower Trilogy
Author: Dennis L. McKiernan
Year: 1988
ISBN-10: 0451921984
Publisher: Signet / New American Library
Price: $11.40
Binding: Paperback
Type: Omnibus
Title Reference: Shadows of Doom
Notes: This is not an omnibus. It's a boxed set of three individual mass-market paperbacks.