Pathfinder Playtest Adventure: Doomsday Dawn

Mysterious ancient artifacts from the early days of desert-choked Osirion count down the years until a rare planetary conjunction that will align Pathfinders world of Golarion with the hostile planet Aucturn, allowing the ravenous hordes of the Dominion of the Black to surge forth and harvest the brains of the Inner Sea, remaking the world in their terrible, alien image.