This is the story of Enel after losing to Luffy on Sky Island. As we know that Enel is very eager to go to the land of God which he called Fairy Vearth. What is Fairy Veart?
Fairy Verth is a legendary land that is desperately wanted to be visited by Enel after destroying Skypiea (Sky Island). To realize his goal Enel built a ship named "Maxim". Although Enel's goal to destroy Sypiea had failed, he had left for Fairy Vearth.