The Edge of Demons

Long ago before the rule of the celestial sister even before the god of chaos. Ten demons rule over Equestia each had unbelievable power. Called themselves gods each ruling over a piece of the country with the elements they controlled. Under their rule their could have been peace but they were greedy wanting more land for themselves, as well as prideful wanting to prove their element was the strongest of them all so they went to war with each other bring the ponies that served them as Solders. This went on for many years until a powerful mage arrived with a plan to seal away these demons. The mage went to a master blacksmith and asked him to make ten weapon from the strongest metal he had. After the weapons were finished the mage tricked the demons gathering them together for one final battle and once they weakened he cast his spell seal them in the ten weapons which became lost to time.