One of the most disruptive techniques in the whole One Piece series belongs to Bartholomew Kuma: Ursus Shock, also known as "Bear Impact." This is one of the most destructive attacks in the series, and it comes from the abilities granted by his Devil Fruit, the Nikyu Nikyu no Mi.
The execution of the Ursus Shock involves Kuma gathering and compressing lots of air using his palms, then releasing it as compressed air. When released, this compressed air suddenly expands and creates a devastating shock wave that can inflict damage in its surroundings. This technique is powerful, equivalent to 5,500 kg of TNT, which makes it one of the strongest attacks in the One Piece world.
This technique was first revealed during the Thriller Bark arc when Kuma used it to very great effect on the Straw Hat Pirates. The force of this shock wave actually overwhelmed almost the entire crew, save for Zoro and Sanji, who were more resistant. This case was powerful in showing just how destructive the technique could be and how it could render many people unable to fight.
The versatility of the Ursus Shock technique makes it effective against large targets and groups. The expansiveness of the shock wave allows Kuma to inflict damage on a wide area, hence hard to avoid for any opponent. This quality was obvious during its use on Thriller Bark, where the technique affected not just individual targets, but the whole battlefield itself, indicative of its strategic utility in huge-scale combat scenarios.
Kuma's powers of the Nikyu Nikyu no Mi go well with his usage of the Ursus Shock. Other abilities that the fruit has bestowed upon him include things such as "Pad Ho" (Pressure Cannon), a technique whereby he pushes the air from around to create pressure shockwaves, and "Puni," which seems to be some sort of defensive maneuver. This, coupled with the Ursus Shock, makes Kuma a powerful warrior with moves for offense and defense.
Most striking of all, however, would have to be the representation in the anime and manga for Ursus Shock. Commonly, it is depicted as a huge, paw-shaped bubble that rips through the air around it before violently exploding into a shockwave. More than a visual cue to indicate that danger is at hand, it serves to drive home the fact that the attack is truly overwhelming in its power. It has become one of the truly unforgettable and great moments of the series, viewing the technique itself.
Kuma's use of the Ursus Shock also shows his strategic mind. He could employ the repulsive energies obtained from his Devil Fruit to disintegrate the enemy formation and create space for further attacks. This strategic application of his powers shows Kuma to be accomplished in tactics and enabled to use his powers to fullness.
Other than featuring within the anime and manga, Ursus Shock has made appearances in various One Piece video games and other merchandise. For example, collectible figures of Bartholomew Kuma usually feature him right before the technique is fired; this may be in an attempt to accentuate the importance of the afore-mentioned technique, thus rendering it a popular culture reference for fans of the series. Such depictions definitely seal the status of the technique as one of the main characteristics defining the character of Kuma.
Through the progression of One Piece, now, Bartholomew Kuma's role and powers continually change. Still, his use of Ursus Shock remains one of his most fearsome weapons and could turn the tide of any battle, truly showing off the power of the Nikyu Nikyu no Mi. It went on to become a testament to just how creative and deep the combat mechanics are within One Piece, by joining unique abilities with strategic applications that forged truly memorable and impactful moments.