The Paramount War at Marineford had ended.
It concluded with the defeat of the Whitebeard Pirates. Fire Fist Ace had been executed, Whitebeard had died, and even Kaido of the Beasts' fate remained unknown.
The Navy had won an overwhelming victory. Although some less-than-honorable aspects of the process had been exposed, a victory was still a victory.
The pirates' strength had been suppressed to an unimaginable degree. Before Whitebeard died, he had not even managed to declare that the One Piece existed. Even if he had, there would have been no Image Den Den Mushi to broadcast his words.
Everyone's last memory was of the Magician, one of the Shichibukai, using a Tailed Beast Bomb to unleash destruction like an apocalyptic natural disaster.
Even people as far away as the Sabaody Archipelago could feel the undersea earthquake.
He had sent Kaido of the Beasts, one of the Four Emperors, flying with a single blow, then followed it with an earth-shattering attack that left Kaido's fate unknown.
Rather than a war against Whitebeard, this Paramount War was more like a battle that made Mage Karn's name.
In Rainbase City, Alabasta, the first thing Karn did after returning was bind Kaido in the basement and have Red Queen design a special prison for him.
There would be blood-replenishing nutrient solution and equipment specifically monitoring Kaido's blood. Once it reached a certain threshold, the excess blood would immediately be drawn out, leaving Kaido no chance to recover.
As for Ship-Leaning King Jack the Drought, his cell was right across from Kaido's to keep him company. If they had the strength to talk, they would not be too bored. After all, Karn was no devil; he would not let Kaido and Jack get too lonely.
Their blood would be useful to him in both