Being an Uchiha, Obito was blessed with quite a strong chakra, along with the powers of the Sharingan.
As the Ten-Tails Jinchūriki, Obito's power exceeded that of even Hashirama Senju, he was able to effortlessly fight three powerful Hokage with ease, overwhelm both Naruto and Sasuke several times, and had the capability to destroy the entire Allied Shinobi Forces.
That being said, one can't deny that Obito's power was virtually limitless.
His Kamui is the stuff of legends, and his transformation into the Ten-Tails Jinchuuriki made him even more of a threat.
If it wasn't for Naruto's powerful words of action, Obito could've easily won the Fourth Shinobi World War single-handedly.
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