One Piece: Lord of Disaster

Many years later, facing the disaster that swept the world, people could not help but recall the day when the Rocks Pirates collapsed. At that time, everyone thought that the world would return to order, but it was not until much later that people realized that a real monster had begun to devour the world from that day on.
After traveling to the world of pirates, Roya accidentally gained the ability to transform into Qiongqi. Qiongqi is a ferocious beast that accompanies natural disasters, so he can create natural disasters; Qiongqi is an evil beast that punishes good and promotes evil, so he can control man-made disasters.
Thus, the world ushered in a real disaster.
"I'm sorry, I'm not here to bring peace to the world. I only want to make the world go to war." Luo Ya said.
It all started with a trainee in the Rocks Pirates.