After running for nearly a quarter-century, One Piece has amassed an immense and colorful cast of villains. Over time, the power of these villains has steadily increased to complement Luffy and his friends' own improvements, to the point that the villains currently being faced are capable of cataclysmic feats. It usually follows that an arc's main villain would probably lose in battle to the next one, and that their powers can be gauged or compared quite well based on the battles that they fought. There is one exception to the rule that stands out in particular: Enel, the primary antagonist of the Skypiea arc.
Prior to the Straw Hats arriving in Skypiea (which as its name implies is an island in the sky), Enel ruled over it as a tyrant, having usurped the position of Kami from the previous holder, Gan Fall. During the arc, he seeks something called Fairy Vearth (revealed later to be the Moon itself), and is willing to destroy all of Skypiea with his powers (conducted by a giant gold ship) to do so.
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What can be definitively stated is the Enel's power is massive, and that initially he appeared almost invincible. Enel ate the Goro Goro no Mi and is consequently living lightning. This ability is as devastating as it sounds. With a known maximum output of 200 million volts, Enel can incinerate most opponents with ease. His nature as a lightning man also gives him frightening speed, and renders him intangible in the face of most physical attacks.
Enel is also one the first confirmed major villain to use Haki, or Mantra as it's called in Skypiea, which, amplified by his Devil Fruit powers grants him near-omnipotence. And as if all of that wasn't enough, Enel's powers also act as
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