Dead

Swain watched the two figures flee in disarray, thoughtfully weighing their usefulness.

He felt that letting them go would be more useful than killing them. At the very least, it planted a ticking time bomb at Blackbeard's side.

Besides.

He was not worried about them betraying him, because Swain had directly shot a tiny "C4" into their hearts.

This was a new scientific invention from Wano Country, which had originally possessed similar technology.

To restrain Yamato, Kaido had placed a Seastone bomb around her neck. The moment she went against Kaido's wishes, he could detonate it at any time and blast her head to pieces.

Building upon that, Swain had abandoned that bulky, heavy-looking collar.

Instead, he had Luo join the project.

Luo had not been sent by Swain to supervise it. He had genuinely participated in the development, because as a ship's doctor, he knew much about hearts and could even produce numerous living hearts for on-site research whenever needed.

Luo's arrival was like adding wings to a tiger. Before long, they had developed the technology Swain wanted and delivered it to him.

They had even given it a name: Dragon Slave.

Once Dragon Slave was shot into a heart, it placed very few restrictions on a Devil Fruit user's abilities, allowing them to use their powers to the fullest extent.

If someone wanted to remove it, that was simple enough: perform open-heart surgery!

Take the needle-tip-sized Dragon Slave out of the heart.

But.

Looking across the entire world, aside from Luo, who had eaten the Op-Op Fruit, no one would dare claim confidence in performing such an operation.

If anyone else truly dared to cut open a heart, it would be no different from killing the patient.

The difficulty was extraordinarily high, and it was also a harsh