The Ring of Fire (The Children of Ynell 1)

In most regions of Ere to be a Seer, gifted with telepathic and visionary powers, means death--or does it? For some it may mean an even worse fate: destruction of their minds and enslavement by the dark powers determined to conquer the world. Zephy and the goatherd Thorn are dismayed to discover that they themselves are Seers, but once they know, they are driven to escape from the repressive city of their birth and rescue others, many of them children, who have been captured and imprisoned by its attackers.

A Kindle edition of this book is available in an omnibus titled The Shattered Stone.