In the scriptures, Lord Shanidev has been called the god of justice. Among all the gods, Shani Dev is the only god whom people worship not with faith but with fear. The main reason for this is that Shanidev has the post of judge. Saturn is considered to be the longest influencing planet in any horoscope. If Saturn is not in the right place in your horoscope or Saturn's Sade Sati or Dhaiya is going on you, then you get failure in every task.
All the obstacles coming in life are removed through Shani Yantra. Shani Yantra also protects you from the wrath of Shani's Sade Sati and Dhaiya.
