Immortal Dark Trilogy: Immortal Dark. Entirely irresistible. Immortal Dark takes the best parts of vampire lore and brings the undying, violent enmity to full throttle. It’s dark, tense and instantly foreboding. I was on the edge of my seat.dark and intense.’Immortal Dark’ by Tigest Girma is a rich, atmospheric and dark vampire fantasy with a bold and new mythology.