The demons at rainbow bridge
From the back cover:
THREE UNIQUE EMPIRES -- THREATENED BY THE DISCOVERY OF ALTERNATE LIFE
The Exchange are consuming the universe's resources through the powers of their cybernetic leaders.
The Mycohlians are parasitic being who, like a virus, can invade and take over other life forms.
The Mizlaplan are a brilliant, long-lived race who will use any means possible to spread the word of the Cosmic All.
These three empires, maintaining a delicate balance of power, have very little in common -- except a strange, recurring legend of a horned demon. Now, a shocking event will change their lives forever: the discovery of two horned creatures, seemingly lifeless and perfectly preserved....
