From the publisher's website:

“Know, O Thief, that these things are mine, For I am the Dark Pharaoh, him of the Crawling Chaos. Take what is mine and your blood will boil in your skin, As I reveal to you my Other Faces and my True Glory.” - Whispers of the Dark Pharaoh Explore ancient mysteries with The Curse of the Dark Pharaoh (Revised Edition). This updated and revised version of the 2006 Arkham Horror expansion adds a terrible threat to your game in the form of the Dark Pharaoh and his mysterious artifacts. With new Exhibit Item and Exhibit Encounter cards, players can uncover the artifacts that have gone missing from the museum’s current “Legacy of the Pharaohs” exhibit. But beware! The Dark Pharaoh will not let his treasures go so easily. The Avatar of Nyarlathotep himself joins the fray with the Dark Pharaoh Herald sheet, spreading his curse throughout the game. Finally, The Curse of the Dark Pharaoh (Revised Edition) also adds Patrolled Neighborhoods, Benefits and Detriments, and Ancient Whispers, all creating additinal layers to your games of Arkham Horror.