What were 2 bad things that mongol did?

The Mongol Empire, under leaders like Genghis Khan, is often criticized for its brutal military campaigns, which resulted in widespread destruction and significant loss of life across Asia and Europe. They employed terror as a psychological weapon, often massacring entire populations of cities that resisted them, such as in the case of Nishapur and Baghdad. Additionally, their conquests led to the displacement of millions and the destabilization of various regions, contributing to long-lasting social and political upheaval.