Soul Jar

The soul jar was a weapon of war. With its power, one could raise an army simply by taking the will of thousands of people, and telling them to follow your every command. One can return wills with it, but without any form of consequence or punishment from the people under his or her influence. One day, a noble thief stole it, took it to a mountaintop, and flung it as far as he could. Now, over a decade later, you find it after killing a mountain goat for food.