Web Of The Witch World: Andre Norton

Witch World Series 1: Book II of The Estcarp Cycle) : After repulsing the Kolder, the land of Estcarp is safe, until a sudden disappearance sends Simon Tregarth and his allies on a quest to stop an enigmatic new danger. Though the Kolder were defeated before, they rise again with a vengeance, and their plot is even more sinister than before. From Karsten in the south to the swamps of Tor to the Kolder’s impenetrable stronghold and beyond, Simon must fight to stop the invaders of his adopted home once and for all. Cover art by Mark Harrison.