The Aavaaz Lacuna, roughly translated as "Voice of the Void" or "Speech of Emptiness" is a tome of dark knowledge about the Void, its powers, and inhabitants.
The book seems to exude a dark aura around it's edges, and staring at the cover for too long may cause the viewer to become entranced as the darkness of the bound cover begins to swirl and deepen into an inky void.
Written in an unusual text that vaguely resembles Trade Tongue, the text is initially unable to be ready clearly. However the longer an individual spends trying to read it, the easier it becomes.