The Kikoukenjutsu Sword School (気功剣術, Kikōkenjutsu; lit. "Energy Control Fencing") is a martial arts academy reported to have been created and instructed by Trunks and Goten after the events of the original Dragon Ball manga. The school debuts in the computer game Dragon Ball Online, along with Krillin's New Turtle School and Tien Shinhan's New Crane School.
After the release of Gohan's book, "Groundbreaking Science", which informed the general public of advanced martial arts, the people of Earth took great interest in fighting. Some specifically gained interest in the theory of channeling ki energy through swords to increase the speed and power of strikes. Gohan's book also revealed that the dense material Kachin could be cut. This greatly intrigued Trunks and Goten, who as adults, created the Kikoukenjutsu Sword School to educate the planet's new generation of warriors.
In Age 820, remnants of Frieza's World Trade Organization attacked Earth and the Kikoukenjutsu Sword School is reported to have played a major role in their defeat; being the only major fighting school established until a year later when Krillin and Tien's schools were founded. The Kikoukenjutsu Sword School still exists as of Age 1000 and is one of the most notable schools on the planet.
Dragon Ball Online
The Martial Artist's Sword Master class represents the Kikoukenjutsu Sword School. They use physical attacks based on swordsmanship, such as Flash. Their skills Sword Slash, Multiple Sword Slashes, and Flash Slash can cause an additional 50% of the damage dealt when performed behind an enemy. Gravity Break and the stronger Focused Gravity Break are attacks of spiritual damage, and show the user channeling yellow ki energy through their sword before striking the enemy.