The Umbral Lexicon of Vor'Xath

This massive tome is bound in pitch-black, oil-slick leather that feels unnaturally cold. The book is constantly enveloped in writhing, semi-solid shadowy tendrils that coil around the spine and creep between the pages like living ink. When the book is opened, these tendrils drift outward like smoke, chilling the air and dimming nearby light sources. The pages are crafted from twilight-hued vellum, and the text within is written in a shimmering violet script that seems to move when not being directly observed.