Passive skills have had a long and storied history. When Diablo III debuted at the [[WWI 2008]], skill trees included passive skills, much like in [[Diablo II]]. In 2010, it was announced that passive skills had been renamed [[traits]] and separated out from active skills. In At the [[July 2011 Press Event]], Blizzard announced that traits were called passive skills were once againin the game, replacing the traits system.