Did Blackbeard Eat Whitebeard?
It Probably Is a Combination of Different Aspects. but Since It Was Only Blackbeard That Displayed the Ability to Use Two Df Powers, We Can Only Conclude Based...
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Hereof, what did Blackbeard do to whitebeard?
When Blackbeard took the Gura Gura no Mi, he used black cloth to cover Whitebeard's body to hide the method that he used on how he gets the power of Tremor Tremor fruit. After Whitebeard died the power of his devil fruit get off of his body then the CURSED RING of Blackbeard started to suck and absorb its power.
Subsequently, question is, how did Blackbeard scar shanks? Shanks got his scar from Blackbeard the time he was with the Roger Pirates or before he created his own crew. At the meeting (ep. 434) with Whitebeard, Shanks said they have been fighting since then, means that Shanks got his scar before he became the captain of Red Hair Pirates.
Likewise, what devil fruit did whitebeard eat?
Gura Gura no Mi
How did Blackbeard get his powers?
Blackbeard has become the first and, so far, only known person to wield the powers of two Devil Fruits at the same time. Through unknown means, he acquired the extremely destructive powers of the Gura Gura no Mi from the dead body of Whitebeard and is now able to create earthquakes like his old captain.