This year you'll be able to embark on two solo quests and a team quest, all designed to bring you face-to-face with three of Hyboria's gruesome lost souls. Speaking of faces, the new reward items include social items like a pictish weapon made of bone and a severed head, a gnarly skull armor helmet, and a spectral visage pet.
The blood-curdling festivities kick off on October 22nd and run through November 2nd. Log into Age of Conan and type /claim, then examine the resulting "partially-translated page" to kick off your first quest. You can also read more about the event on the official boards.