He was not that powerful. It was not that he lacked that kind of strength, but that he could not control it for the time being. The only reason he could act so recklessly was rather embarrassing to admit: he could fly, while the others could not, and even those who could fly were no match for him.
Otherwise, why would he still be fooling around at sea? If he were truly invincible, after Enies Lobby, he could go to Impel Down, then Navy Headquarters, and finally Mary Geoise. Then, in front of the whole world, he could roar, "I'm the king who rules this world! If you don't accept it, come at me!" Wouldn't Devil Fruits come running to him on their own? So it was all nonsense. The main reason he had not done that was because he was not strong enough yet. This world had powerful people and all kinds of Devil Fruit abilities. It was not as simple as declaring himself invincible and becoming invincible.
Just now, Chen Fan had used the immense pressure of Conqueror's Haki to condense his killing intent even further. He finally understood why he had not made any progress: he lacked sufficient external mental pressure.
When his killing intent and Conqueror's Haki finally erupted, the impact of Conqueror's Haki battered Chen Fan's nerves. The interdimensional matter that Chen Fan had never managed to melt became his best shield. It was the first time Chen Fan had felt that this thing was so useful. As the saying went, a blessing in disguise. Otherwise, even with Chen Fan's enhanced brain, facing that mental explosion might have caused him to fall unconscious or suffer brain damage. If it affected his computing power, there was no shared network of ten thousand Misaka Sisters here to