The Summon Stone: The Gates of Good and Evil, Book One (A Three Worlds Novel)

The Merdrun, cruel warriors blooded by thousands of years of slaughter, are gathering in the void between the worlds.
Their long-hidden summon stone is waking, corrupting good people as well as bad, and turning arcane places into magically polluted wastelands. If it is not destroyed it will create a portal and call the Merdrun through.
In a nightmare, a nine-year-old girl sees the Merdrun leader - and he sees her. If her parents Karan and Llian are to save their daughter and their world, they must find a way to stop the greatest warrior in the void.