The Four Lords of the Diamond

From Author Wars - https://authorwars.com/publications/the-four-lords-of-the-diamond-40153.html

Overview:

Title: The Four Lords of the Diamond
Author: Jack L. Chalker
Year: 1983
Publisher: Nelson Doubleday / SFBC
Price: $7.98
Pages: [2]+755
Binding: Hardcover
Type: Omnibus
Title Reference: Lilith: A Snake in the Grass
Notes:
Page 754 has code "N07"; known reprint code "O06" [Feb. '84] Code suggests that SFBC Medusa novel was printed two months before Del Rey pb, it was a main Selection of the SFBC in March Currey notes this as the 1st SFBC printing. Contento lists this as a trade paperback (with the same price), almost surely an error, and it seems quite unlikely that SFBC would have released both hc and tp versions at the same price.