The downfall and destruction of a hero in a tragedy is primarily the result of a tragic (flaw or action) in his or her character?

• MsLit: flaw
  
  Typically in tragedies, the end is not brought about by one specific action that a character takes or specific choice they make. Usually it is because that character has a fatal flaw that the tragedy happens. This flaw in their nature causes them to make poor decisions and act in certain ways, and is the root of the tragedy. 
• TobeySnaps:

  The answer should be flaw.