The English name of the Rebellion Blade meant "resistance." It represented Sparda or Dante resisting invaders from the Demon Realm for the sake of the human world.
It also granted Dante incredibly powerful offensive strength.
It was sharp enough to pierce the surface of the Savior's body, even though the Savior was powered by Sparda's Sword.
It was also one of the most durable objects in the series, capable of withstanding Yamato's spatial cuts and direct punches from the Savior.
But that did not mean that obtaining the Rebellion Blade would let someone stab themselves in the chest and activate the power of their Demon Bloodline. That was impossible.
Dante's blood could awaken Rebellion's power, but Dante had to actively draw out his own latent power for the blood to take effect. This was supported by the Devil May Cry 3 manga.
In the manga, Dante's dormant demonic power had briefly become active, and his blood changed Rebellion's appearance. But when Dante's power went dormant again, Rebellion likewise entered hibernation.
Dante could channel demonic power into the sword and create Shockwaves with astonishing destructive power.
Its thick blade made it more suited for close combat than Yamato. The sword could even fly out to attack enemies according to Dante's will, immediately returning when Dante recalled it.
Yamato's ability was "separation," while the Rebellion Greatsword's ability seemed to be "fusion." In Devil May Cry 5, Rebellion's blade was shattered by the Demon King Urizen, leaving only its seemingly useless hilt behind. Dante temporarily replaced it with Sparda's Sword.
Later, Dante wondered why his father had given him Rebellion and wanted to know whether it possessed any miraculous power. So Dante stabbed himself with a fragment of Rebellion. As a result, Dante awakened the power of the True Demon, and Rebellion absorbed