Rocks D. Xebec was known as the captain of the Rocks Pirates, an incredibly powerful crew that ruled the seas 40 years before the current One Piece timeline. What’s even more remarkable is that key members of the Rocks crew later became some of the most notorious pirates: Kaido, Big Mom, and Whitebeard. Xebec’s ability to gather and lead such monsters alone proves his immense stature and strength.
However, information about Rocks D. Xebec is scarce, making him one of the most mysterious characters in One Piece. Still, through recent chapter reveals, we can begin to grasp the terrifying power he wielded.
Rocks D. Xebec’s strength was so overwhelming that the Navy couldn’t handle him alone. To stop him, Vice Admiral Monkey D. Garp was forced to ally with his rival, the future Pirate King Gol D. Roger. The battle at God Valley between the Garp-Roger alliance and the Rocks Pirates went down as one of the greatest fights in One Piece history. The fact that the two strongest legends of the time had to cooperate to defeat Xebec shows he likely matched or even surpassed each of them in direct combat.
1. Master Swordsmanship

From the start, Xebec is often depicted holding a sword and is indeed a swordsman. His fighting style is devastating. His slashes carry the force of a giant hammer strike or a cannon blast. Everything around him can be blown away by this power, which he used to attack Loki.
2. Possession of Advanced Conqueror’s Haki

As a legendary captain, it’s highly likely Rocks D. Xebec possessed all three types of Haki, including Conqueror’s Haki. Chapter 1155 revealed that Xebec indeed wielded Conqueror’s Haki. When his powerful slash clashed with King Harald’s slash, who also possessed Conqueror’s Haki, the impact was so great it reached Mary Geoise, 5 kilometers away.
Notably, with his ambition and authority, Xebec’s Conqueror’s Haki may have reached an advanced level, allowing him to strike opponents physically without touching them or to coat his sword with this Haki.
3. Boxing Skills

In short, Rocks D. Xebec’s physical strength was extraordinary from the start. Combined with his swordsmanship and Haki, the effect was even more terrifying. Chapter 1155 hints that he sometimes didn’t even need a sword.
During a Davy Back Fight, Xebec defeated his opponent in a boxing match. So even in one-on-one fights, he was extremely dangerous.
4. A Formidable Mind

Somehow, Xebec was aware of Imu’s existence and confronted this entity. However, he was wise enough to retreat without fighting, only promising to return. This suggests Xebec knew Imu might not be an opponent he could defeat at that time.
Later, when the Hachinosu Pirate Island was discovered to have gold mines, Xebec negotiated with the World Government to become their mercenary to seize the island. The catch was that from the start, Xebec intended to claim the island for himself.
Four years after meeting Harald, the Rocks Pirates were established at Hachinosu, making Xebec’s plan a reality. His ability to plan long-term and willingness to deceive others to get what he wanted strongly resemble his son, Blackbeard.
However, there is a difference: Xebec tended to attack head-on and aggressively, while Blackbeard is more patient, preferring to operate in the shadows and wait for the right moment to strike decisively.
Additionally, Xebec always won in Davy Back Fights. Considering the Straw Hats’ encounters with Foxy, Davy Back Fights are often tricky games between pirates. Xebec’s winning record shows his cunning and adaptability to the rules, despite the challenges.
In conclusion, although information about Rocks D. Xebec remains limited, what we know paints a picture of a pirate with extraordinary power, limitless ambition, and the most worthy rival Pirate King Gol D. Roger ever faced. He truly is one of the greatest and most fearsome legends in One Piece history.