Crystal Gorge. Book Three of The Dreamers

The unspeakable Creature of the Wasteland is on the fast track to world domination as the time approaches for the Younger Gods to take over from their elders. The vast resources of the Gods are marshalled to bring a halt to the spread of evil, but there is pestilence and skirmishing, and suddenly the balance of power shifts. The Ruler of the Wasteland has infiltrated the land of short summers, where the strange and marvellous crystal gorge, which can be no natural formation of rock, is destined to become a battleground of great beauty and great terror.
The enemy is closer to knowing the secrets of the Treasured One and the Dreamers are in grave danger of delivering a nightmare to the world of the Elder Gods.