The manga of ONE PIECE has seen the participation of many powerful individuals in the various battles that have taken place at work. Whitebeard, Gol D. Roger, Shanks, and many others have found strengths that are abnormal and unattainable for normal people. There are those who strive to reach these peaks, like the protagonist Monkey D. Luffy.
In ONE PIECE 1009, however, the young man in the straw hat had to experience what it really means to be emperor. After the color page designed by Eiichiro Oda and a short break with Red and Orochi Foderi, the mangaka brought back the watch out for the battle on the dome. Luffy's shots don't hit Kaido and Big Mom decided to show the young people in front of them why they are so feared all over the sea.
The two coordinated emperors, one with his own bagua and the other with Napoleon, gave life to the Hakai. The attack in question, which is actually also a play on words with Haki, marks their "sovereignty over the ocean": The duo creates a huge shock wave that Zoro can barely slow down and then push back to gain valuable seconds for the four teammates. According to the two emperors, the attack could usually be strong enough to kill at least some of the pirates in front of them.
This The combination between Kaido and Big Mom could also be ONE PIECE's most devastating attack, At least for now.