Demon of the Dark Ones(1982)
(The sixth book in the War of Powers series)
A novel by Victor Milán and Robert E Vardeman
Lizards 427 Humans 12. the final confrontation between nonhumans and humans does not bode well for the latter. The treacherous Fallen Ones are busy killing everyone in sight - and doing a good job of it. Their most powerful weapon is the Demon of the Dark Ones, an infinite alien being that gathers strength from death and destruction.
Used availability for Victor Milan's Demon of the Dark Ones
June 1986 : USA Mass Market Paperback
1982 : USA Paperback