The phrase "a thousand screaming souls" appears frequently across fantasy, sci-fi, and horror contexts, ranging from the lore of to heavy metal lyrics and tabletop RPG scenarios.
Your party finds a tattered, velvet hood hidden in the lich’s treasury. It looks mundane until someone puts it on. Suddenly, the world turns grey, and the wearer is hit with a cacophony that sounds like . a_thousand_screaming_souls
The wearer can see into the Ethereal Plane, but they must succeed on a DC 16 Wisdom Save or be Stunned by the psychic noise for one round. The phrase "a thousand screaming souls" appears frequently