Heir of Rengarth — Carole Nelson Douglas

Silver-eyed is Irissa, last seeress of her Torloc race. She carries within her the child of her love, Kendric; together they have brought peace to Edanvant. When Irissa is struck down mysteriously, Kendric is convinced that it is the work of Geronfrey, the evil wizard who seeks Irissa's very essence. Kendric enters Geronfrey's Tower to confront him--and vanishes into Rengarth, a land of enchantment that can poison as well as seduce.
Irissa knows that to save Kendric, she must travel to this most dangerous land; a land where the dreaded greenweavers enmesh the living. Kendric and Irissa will need all of their powers to survive, to confront the horrifying future that Geronfrey is creating for them...and for their child.