The Land of the Mist

From Author Wars - https://authorwars.com/books/the-land-of-the-mist-1217830.html

Overview:

Title: The Land of the Mist
Author: Kenneth Bulmer
Year: 1976
Type: Novels
Series: The Gladiator ... (US) / The Eagles (UK)
Number in Series: 2

Variant Titles:

1976. The Land of Mist