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If we see our past, many years ago there was stone age, then it comes to metal age. People start using metals to make things. After many years it come to nuclear era, where with one nuclear bomb, one can change the whole geography of a country or continent.
But, now it comes to most powerful weapon till exist, we call that thing ' a pen '. this is the weapon which can change the history, geography economy or can say , the face of entire nation at a time. 
When we see the history of its intention, the first patent on ball pen was issued to John J Loud.
We can proudly say that the modern era is the age of pen, where without any violence everything can be done.
So, we can consider pen the powerful weapon.