A clash between Gol D. Roger and Whitebeard is shown for the first time in chapter 966. This is the first time Roger’s strength is displayed!
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Roger was a tremendously powerful swordsman, as shown when he overpowered the legendary master samurai Kozuki Oden with only one strike.
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Roger uses an attack called “Kamusari”. Holding his sword in his right hand, Roger swings it up to his left shoulder, creating a powerful shockwave to hit his opponent’s torso. It was powerful enough to overwhelm Oden’s two-sword defense!
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Roger possessed immense mastery over Busoshoku Haki, being as powerful as Edward Newgate in his prime 30 years prior. He could imbue his saber, hardening it and causing a stream of black flame-like aura just as large at himself to flow out from his sword. As a testament to his mastery, he could even overpower Kozuki Oden, who was a master of Busoshoku Haki in his own right.
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Roger also possessed Haoshoku Haki, which was seen when he clashed with fellow Haoshoku Haki user, Edward Newgate.
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Their clash created a notable effect similar to lightning and released a large burst that traveled across the island that they were on and pushing back the Moby Dick alongside the nearby trees and people!
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Both Roger and Whitebeard proved their mastery and advancement of Busoshoku Haki to where they could emit it from a short distance using their weapons resulted in a gigantic shock wave that spread across the island despite their weapons not coming into contact with one another.
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This is the power of the 2 strongest characters in the whole series!