This expansion to the Arkham Horror Series, introduces a major new mechanic to the game -- Heralds, who prepare the way for the Ancient One to arrive. In addition, old familiar faces will be turned against the investigators in ways they never expected. Featuring over 160 new cards, The King in Yellow heralds a darker age for Arkham Horror fans. 13 Blight cards, old friends gone irretrievably mad. 7 Magical Effect cards representing powerful new abilities. The new Herald mechanic and the King in Yellow Herald. 3 new Monster tokens, more horrible than any before! Over 160 new cards, detailing new items, new spells, and new horrible happenings in Arkham and beyond!