Warning! Contains major spoilers for One Piece chapter #1040
The stability of the world of One Piece is based on three «Great Powers»: the Marine Headquarters, the Shichibukai, the Four Emperors. These are the major military powers, whose balance is needed to maintain world peace. After receiving a strong blow during the events of the "War for the Summit", that order has now been shaken to the core, as one of the Four Emperors is finally defeated by the pirates of the Worst Generation.
The Four Emperors (Yonko) are the four strongest pirates in the world, whose rule extends over the second part of the Grand Line, known as the New World. They are considered the closest to obtaining the title of Pirate King, and their military strength and their agendas put them among the top enemies of the World Government. Big Mom is one of them, the matriarch of the large Linlin clan and the ruthless ruler of the Totto Land country that she wants to make into a utopia in which all races of the world can live together. She is also a monster with unbelievable strength and the dangerous powers of the Soru Soru no Mi Devil Fruit, but her rule as a Yonko finally came to an end, thanks to the pirate captains Trafalgar Law and Eustass Kid.
Related: One Piece: Luffy Is Finally Unlocking His True Power against Kaido
During the Wano Arc, an alliance was formed between the samurai of the country and the crews of three pirates of the Worst Generation, Luffy, Law, and Kid, with the goal of taking down Emperor Kaido and ending his tyrannical rule over Wano. When Big Mom unexpectedly formed an alliance with Kaido, the situation looked dire, as two of the strongest pirates in the world had joined forces. However, the rebel forces' assault on Onigashima
Read more on screenrant.com