Trafalgar D. Water Law
After usin his "Room" technique, with his sword, Law undoes all body parts of one or more enemies. Those affected do not die when they limbs are cut, and even live if their head was removed. Once done, he can exchange the position of the objects in the circle, such as a cannonball for a head.
Law creates a powerful electric shock over the chest of his opponent, similar to a defibrillator, able knock him out. The "countershock" is a electroshoks therapy.
Gamma KnifeKanji: ガンマナイフ
Translation: Gamma Knife
Injection ShotKanji: 注射（インジェクション）ショット
Translation: Injection Shot
Inside his "Room", with a impulse of his arm, Law is able to cast a energy wave capable of performing a clean cut on his opponent taking out one of his vital organs, such as the heart. "Mes" is the Dutch word for "scalpel".
Radio KnifeKanji: ラジオナイフ
Translation: Radio Knife
This is Law's basic technique. With his ability, Law calls for a huge circle that apparently has no effect. This circle becomes the operating table in his particular "operation room", in which he has complete control over everithing on it through his other techniques.
Law scans of subjects in his "Room" in search of a hidden object, for example, in search of the Ko Den Den Mushi in their pockets.
Law moves an object inside his "Room" moving his index finger as a baton.