|Gohan holding the Z Sword|
|Debut||Manga: "A Time of Trial"|
Anime: "Learn to Fuse!"
Future Trunks' sword
The Z Sword looks like a hand-and-a-half sword. Judging by its thin cross-section and wide blade, it appears to be optimized for cutting as opposed to thrusting.
Once every 1,000 years, the Supreme Kais and the Gods of Destruction go to each other's realms and hold a coordination meeting. During one of these meetings, held roughly 75 Million Before Age, they got into an argument over some trifling thing and a certain short-tempered God of Destruction, Beerus, sealed Old Kai away inside the Z Sword as it would not have been proper for him to destroy the Sacred World of the Kais itself. As hard as they tried, none of the Kais that attempted to release the Z Sword were successful.
In Age 774, with Gohan needing medical attention, Supreme Kai brings him to the Sacred World of the Kais to heal as well as to try and release the Z Sword so as to gain access to its legendary power. Despite great difficulty and Kibito constantly decrying him for being a mere mortal, Gohan is successful in freeing the sword upon transforming into a Super Saiyan, stunning Kibito in the process. Though finding difficult to hold the sword due to its weight, Gohan begins training to wield it.
Later on when Goku visits the Sacred World of the Kais after returning to Other World, he tests Gohan by hurling a large boulder towards him, which the Z Sword cuts through easily. In order to test the sword's limits, Supreme Kai materializes a giant cube made of Katchin, the densest material in the universe, to give Goku to throw at Gohan. Unfortunately, the Z Sword breaks when attempting to slice through the cube. Despite Supreme Kai and Kibito expressing shock and great disappointment over this, not all hope was lost, as the breaking of the blade released the power held within the sword.
- The legend of the Z Sword mirrors the Arthurian legend of the Sword in the Stone, with it also being incredibly hard to pull out and it later being broken.
- The name "Zeta Sword" used in the English manga matches the Greek pronunciation for the letter Z, "Zeta".