Genghis Khans most Horrific punishments

The Mongols were once the largest land empire in human history. What made them such a fearsome empire was not their numbers. Instead, it was their strategy to build a fearsome reputation.

They did so by committing fear-inspiring acts, making an example of their enemies by executing them through suffocation, or by sending horses to trample them alive.

Terror was their policy to conquer other groups by lowering their morale to fight back. Chief among the terrifying Mongols was Genghis Khan, known by some as the Great Khan.

Why was Genghis Khan known as one of the bloodiest conquerors in the history of humanity?