Having the ambition and desire to conquer, and getting into fighting battles could be the symbolism behind dreaming about Genghis Khan. For example, for an individual who feels of weak and powerless, dreaming about Genghis might be a personification of their deep feelings for a complete change to turn things around in order for them to feel strong and powerful.
Dreaming about Genghis Khan can represent your feelings of wanting to conquer and defending yourself at the same time. Reaching a goal in your occupation often involves vulnerability and high-stakes, which is why people may substitute fantasies of Genghis Khan, letting him do the conquering for them.