Shanks is one of the strongest characters in Eiichiro Oda's One Piece. As one of the Four Emperors of the Sea, Shanks has already established himself as quite a powerful pirate who is feared all over the world. While it's been known for quite a while that Shanks is powerful, his exact abilities have remained unknown for quite a long time. In fact, Shanks has barely ever fought since the beginning of the series.
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Shanks was seen using Conqueror's Haki on a few occasions, however, other than that, nothing about his fighting capabilities was revealed until recently. With One Piece heading into its Final Saga, along with the release of One Piece Film Red, a lot of focus has been thrown on the red-haired pirate and fans now know a lot about his fighting abilities. As expected, all of his powers are quite fearsome and Shanks is a true master of Haki. One such ability of his has earned him the title of the «Killer of Observation Haki.»
Observation Haki is one of the two main types of Haki in the One Piece world. It grants a sixth sense to the user which allows them to see incoming attacks in their mind's eye, sense emotions, intent, danger, and gauge other people's strength, among many other things. Using this ability, a fighter can truly reach the next level. Observation Haki is, thus, one of the most important abilities in the series, and all the elite fighters rely on it. Some have even developed a specialization in this ability such as Sanji of the Straw Hat Pirates, Charlotte Katakuri of the Big Mom Pirates, or Yasopp of the Red Hair Pirates. These fighters are known to be exceptionally calm in battle and thus their Observation Haki is on the next level. After all,
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